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hi,
I have One GridView. In My Gridview there are two Combobox columns like Country and State.
When I Change Country that time State will have to change.
In My simple application it work but in MVVM it does not work.
Please Help me.
My VIEW-MODEL Class Looks Like this:
using System;
using System.Net;
using System.Linq;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Ink;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using System.Collections.ObjectModel;
//using SilverlightWithWCFService.ServiceReference1;
using Telerik.Windows.Controls;
using System.ComponentModel;
using System.Collections.Generic;
namespace SilverlightWithWCFService.Model
{
    public class CustomerViewModel : INotifyPropertyChanged
    {
        private int cID;
        public int CID
        {
            get
            {
                return this.cID;
            }
            set
            {
                this.cID = value;
                this.OnPropertyChanged("CID");
                CustromerList c = new CustromerList() { Country = CID };
                StateList = c.AvailableState.ToList();
            }
        }
        private ObservableCollection<CustromerList> objsearchList;
        public ObservableCollection<CustromerList> objSearchList
        {
            get
            {
                return this.objsearchList;
            }
            set
            {
                this.objsearchList = value;
                this.OnPropertyChanged("objSearchList");
            }
        }
        List<Country> countryList = new List<Country>();
        public List<Country> CountryList
        {
            get { return countryList; }
            set
            {
                this.countryList = value;
                this.OnPropertyChanged("CountryList");
            }
        }
        List<State> stateList = new List<State>();
        public List<State> StateList
        {
            get
            {
                CustromerList c = new CustromerList() { Country = CID };
                stateList = c.AvailableState.ToList();
                return stateList;
            }
            set
            {
                this.stateList = value;
                this.OnPropertyChanged("StateList");
            }
        }
        public CustomerViewModel()
        {
            countryList = AllLocations.Countries;
            CountryList = countryList;
            CID = 1;
            objsearchList = new ObservableCollection<CustromerList>();
            for (int i = 1; i <= 10; i++)
            {
                objsearchList.Add(new CustromerList()
                {
                    CustomerID = i,
                    CompanyName = i.ToString(),
                    ContactName = i.ToString(),
                    Country = 1,
                    State = 1
                });
                objSearchList = objsearchList;
                //SampleServiceClient client = new SampleServiceClient();
                //client.CustomerListCompleted += new EventHandler<CustomerListCompletedEventArgs>(client_CustomerListCompleted);
                //client.CustomerListAsync();
            }
        }
        //void client_CustomerListCompleted(object sender, CustomerListCompletedEventArgs e)
        //{
        //    objsearchList = new ObservableCollection<CustromerList>();
        //    foreach (Customer item in e.Result)
        //    {
        //        objsearchList.Add(new CustromerList()
        //        {
        //            CustomerID = item.CustomerName,
        //            CompanyName = item.CompanyName,
        //            ContactName = item.ContactName,
        //            Country = 1,
        //            State = 1
        //        });
        //    }
        //    objSearchList = objsearchList;
        //}
        void OnPropertyChanged(string property)
        {
            if (this.PropertyChanged != null)
                this.PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
        public event PropertyChangedEventHandler PropertyChanged;
    }
    #region Classes
    public class Country
    {
        public int CountryID { get; set; }
        public string CountryName { get; set; }
    }
    public class State
    {
        public int StateID { get; set; }
        public string StateName { get; set; }
        public int CountryID { get; set; }
    }
    public class CustromerList : INotifyPropertyChanged
    {
        private int customerID;
        public int CustomerID
        {
            get
            {
                return this.customerID;
            }
            set
            {
                if (this.customerID != value)
                {
                    this.customerID = value;
                    this.OnPropertyChanged("CustomerID");
                }
            }
        }
        private string companyName;
        public string CompanyName
        {
            get
            {
                return this.companyName;
            }
            set
            {
                if (this.companyName != value)
                {
                    this.companyName = value;
                    this.OnPropertyChanged("CompanyName");
                }
            }
        }
        private string contactName;
        public string ContactName
        {
            get
            {
                return this.contactName;
            }
            set
            {
                if (this.contactName != value)
                {
                    this.contactName = value;
                    this.OnPropertyChanged("ContactName");
                }
            }
        }
        private int country;
        public int Country
        {
            get
            {
                return this.country;
            }
            set
            {
                if (this.country != value)
                {
                    this.country = value;
                    this.OnPropertyChanged("Country");
                    this.State = null;
                }
            }
        }
        private int? state;
        public int? State
        {
            get
            {
                return this.state;
            }
            set
            {
                if (this.state != value)
                {
                    this.state = value;
                    this.OnPropertyChanged("State");
                }
            }
        }
        public IEnumerable<State> AvailableState
        {
            get
            {
                return from c in AllLocations.States
                       where c.CountryID == this.Country
                       select c;
            }
        }
        void OnPropertyChanged(string property)
        {
            if (this.PropertyChanged != null)
                this.PropertyChanged(this, new PropertyChangedEventArgs(property));
        }
        public event PropertyChangedEventHandler PropertyChanged;
    }
    public static class AllLocations
    {
        public static List<Country> Countries;
        public static List<State> States;
        static AllLocations()
        {
            Countries = new List<Country>();
            Countries.Add(new Country() { CountryID = 1, CountryName = "Asia" });
            Countries.Add(new Country() { CountryID = 2, CountryName = "Europe" });
            Countries.Add(new Country() { CountryID = 3, CountryName = "Africa" });
            Countries.Add(new Country() { CountryID = 4, CountryName = "Oceania" });
            Countries.Add(new Country() { CountryID = 5, CountryName = "North America" });
            Countries.Add(new Country() { CountryID = 6, CountryName = "South America" });
            Countries.Add(new Country() { CountryID = 7, CountryName = "Antarctica" });
            States = new List<State>();
            States.Add(new State() { StateID = 1, CountryID = 1, StateName = "Afghanistan, Islamic Republicof" });
            States.Add(new State() { StateID = 3, CountryID = 2, StateName = "Albania, Republic of" });
            States.Add(new State() { StateID = 4, CountryID = 3, StateName = "Algeria, Peoples DemocraticRepublic of" });
            States.Add(new State() { StateID = 5, CountryID = 4, StateName = "American Samoa" });
            States.Add(new State() { StateID = 6, CountryID = 2, StateName = "Andorra, Principality of" });
            States.Add(new State() { StateID = 7, CountryID = 3, StateName = "Angola, Republic of" });
            States.Add(new State() { StateID = 8, CountryID = 5, StateName = "Anguilla" });
            States.Add(new State() { StateID = 9, CountryID = 7, StateName = "Antarctica (the territory South of 60 deg S)" });
            States.Add(new State() { StateID = 10, CountryID = 5, StateName = "Antigua and Barbuda" });
            States.Add(new State() { StateID = 11, CountryID = 6, StateName = "Argentina, Argentine Republic" });
            States.Add(new State() { StateID = 12, CountryID = 1, StateName = "Armenia, Republic of" });
            States.Add(new State() { StateID = 13, CountryID = 5, StateName = "Aruba" });
            States.Add(new State() { StateID = 14, CountryID = 4, StateName = "Australia, Commonwealth of" });
            States.Add(new State() { StateID = 15, CountryID = 2, StateName = "Austria, Republic of" });
            States.Add(new State() { StateID = 16, CountryID = 1, StateName = "Azerbaijan, Republic of" });
            States.Add(new State() { StateID = 17, CountryID = 5, StateName = "Bahamas, Commonwealth of the" });
            States.Add(new State() { StateID = 18, CountryID = 1, StateName = "Bahrain, Kingdom of" });
            States.Add(new State() { StateID = 19, CountryID = 1, StateName = "Bangladesh, Peoples Republic of" });
            States.Add(new State() { StateID = 20, CountryID = 5, StateName = "Barbados" });
            States.Add(new State() { StateID = 21, CountryID = 2, StateName = "Belarus, Republic of" });
            States.Add(new State() { StateID = 22, CountryID = 2, StateName = "Belgium, Kingdom of" });
            States.Add(new State() { StateID = 23, CountryID = 5, StateName = "Belize" });
            States.Add(new State() { StateID = 24, CountryID = 3, StateName = "Benin, Republic of" });
            States.Add(new State() { StateID = 25, CountryID = 5, StateName = "Bermuda" });
            States.Add(new State() { StateID = 26, CountryID = 1, StateName = "Bhutan, Kingdom of" });
            States.Add(new State() { StateID = 27, CountryID = 6, StateName = "Bolivia, Republic of" });
            States.Add(new State() { StateID = 28, CountryID = 2, StateName = "Bosnia and Herzegovina" });
            States.Add(new State() { StateID = 29, CountryID = 3, StateName = "Botswana, Republic of" });
            States.Add(new State() { StateID = 30, CountryID = 7, StateName = "Bouvet Island (Bouvetoya)" });
            States.Add(new State() { StateID = 31, CountryID = 6, StateName = "Brazil, Federative Republic of" });
            States.Add(new State() { StateID = 32, CountryID = 1, StateName = "British Indian Ocean Territory (Chagos Archipelago)" });
            States.Add(new State() { StateID = 33, CountryID = 5, StateName = "British Virgin Islands" });
            States.Add(new State() { StateID = 34, CountryID = 1, StateName = "Brunei Darussalam" });
            States.Add(new State() { StateID = 35, CountryID = 2, StateName = "Bulgaria, Republic of" });
            States.Add(new State() { StateID = 36, CountryID = 3, StateName = "Burkina Faso" });
            States.Add(new State() { StateID = 37, CountryID = 3, StateName = "Burundi, Republic of" });
            States.Add(new State() { StateID = 38, CountryID = 1, StateName = "Cambodia, Kingdom of" });
            States.Add(new State() { StateID = 39, CountryID = 3, StateName = "Cameroon, Republic of" });
            States.Add(new State() { StateID = 40, CountryID = 5, StateName = "Canada" });
            States.Add(new State() { StateID = 41, CountryID = 3, StateName = "Cape Verde, Republic of" });
            States.Add(new State() { StateID = 42, CountryID = 5, StateName = "Cayman Islands" });
            States.Add(new State() { StateID = 43, CountryID = 3, StateName = "Central African Republic" });
            States.Add(new State() { StateID = 44, CountryID = 3, StateName = "Chad, Republic of" });
            States.Add(new State() { StateID = 45, CountryID = 6, StateName = "Chile, Republic of" });
            States.Add(new State() { StateID = 46, CountryID = 1, StateName = "China, Peoples Republic of" });
            States.Add(new State() { StateID = 47, CountryID = 1, StateName = "Christmas Island" });
            States.Add(new State() { StateID = 48, CountryID = 1, StateName = "Cocos (Keeling) Islands" });
            States.Add(new State() { StateID = 49, CountryID = 6, StateName = "Colombia, Republic of" });
            States.Add(new State() { StateID = 50, CountryID = 3, StateName = "Comoros, Union of the" });
            States.Add(new State() { StateID = 51, CountryID = 3, StateName = "Congo, Democratic Republic ofthe" });
            States.Add(new State() { StateID = 52, CountryID = 3, StateName = "Congo, Republic of the" });
            States.Add(new State() { StateID = 53, CountryID = 4, StateName = "Cook Islands" });
            States.Add(new State() { StateID = 54, CountryID = 5, StateName = "Costa Rica, Republic of" });
            States.Add(new State() { StateID = 55, CountryID = 3, StateName = "Cote d'Ivoire, Republic of" });
            States.Add(new State() { StateID = 56, CountryID = 2, StateName = "Croatia, Republic of" });
            States.Add(new State() { StateID = 57, CountryID = 5, StateName = "Cuba, Republic of" });
            States.Add(new State() { StateID = 58, CountryID = 1, StateName = "Cyprus, Republic of" });
            States.Add(new State() { StateID = 59, CountryID = 2, StateName = "Czech Republic" });
            States.Add(new State() { StateID = 60, CountryID = 2, StateName = "Denmark, Kingdom of" });
            States.Add(new State() { StateID = 61, CountryID = 3, StateName = "Djibouti, Republic of" });
            States.Add(new State() { StateID = 62, CountryID = 5, StateName = "Dominica, Commonwealth of" });
            States.Add(new State() { StateID = 63, CountryID = 5, StateName = "Dominican Republic" });
            States.Add(new State() { StateID = 64, CountryID = 6, StateName = "Ecuador, Republic of" });
            States.Add(new State() { StateID = 65, CountryID = 3, StateName = "Egypt, Arab Republic of" });
            States.Add(new State() { StateID = 66, CountryID = 5, StateName = "El Salvador, Republic of" });
            States.Add(new State() { StateID = 67, CountryID = 3, StateName = "Equatorial Guinea, Republic of" });
            States.Add(new State() { StateID = 68, CountryID = 3, StateName = "Eritrea, State of" });
            States.Add(new State() { StateID = 69, CountryID = 2, StateName = "Estonia, Republic of" });
            States.Add(new State() { StateID = 70, CountryID = 3, StateName = "Ethiopia, Federal DemocraticRepublic of" });
            States.Add(new State() { StateID = 71, CountryID = 2, StateName = "Faroe Islands" });
            States.Add(new State() { StateID = 72, CountryID = 6, StateName = "Falkland Islands (Malvinas)" });
            States.Add(new State() { StateID = 73, CountryID = 4, StateName = "Fiji, Republic of the Fiji Islands" });
            States.Add(new State() { StateID = 74, CountryID = 2, StateName = "Finland, Republic of" });
            States.Add(new State() { StateID = 75, CountryID = 2, StateName = "France, French Republic" });
            States.Add(new State() { StateID = 76, CountryID = 6, StateName = "French Guiana" });
            States.Add(new State() { StateID = 77, CountryID = 4, StateName = "French Polynesia" });
            States.Add(new State() { StateID = 78, CountryID = 7, StateName = "French Southern Territories" });
            States.Add(new State() { StateID = 79, CountryID = 3, StateName = "Gabon, Gabonese Republic" });
            States.Add(new State() { StateID = 80, CountryID = 3, StateName = "Gambia, Republic of the" });
            States.Add(new State() { StateID = 81, CountryID = 1, StateName = "Georgia" });
            States.Add(new State() { StateID = 82, CountryID = 2, StateName = "Germany, Federal Republic of" });
            States.Add(new State() { StateID = 83, CountryID = 3, StateName = "Ghana, Republic of" });
            States.Add(new State() { StateID = 84, CountryID = 2, StateName = "Gibraltar" });
            States.Add(new State() { StateID = 85, CountryID = 2, StateName = "Greece, Hellenic Republic" });
            States.Add(new State() { StateID = 86, CountryID = 5, StateName = "Greenland" });
            States.Add(new State() { StateID = 87, CountryID = 5, StateName = "Grenada" });
            States.Add(new State() { StateID = 88, CountryID = 5, StateName = "Guadeloupe" });
            States.Add(new State() { StateID = 89, CountryID = 4, StateName = "Guam" });
            States.Add(new State() { StateID = 90, CountryID = 5, StateName = "Guatemala, Republic of" });
            States.Add(new State() { StateID = 91, CountryID = 2, StateName = "Guernsey, Bailiwick of" });
            States.Add(new State() { StateID = 92, CountryID = 3, StateName = "Guinea, Republic of" });
            States.Add(new State() { StateID = 93, CountryID = 3, StateName = "Guinea-Bissau, Republic of" });
            States.Add(new State() { StateID = 94, CountryID = 6, StateName = "Guyana, Co-operative Republicof" });
            States.Add(new State() { StateID = 95, CountryID = 5, StateName = "Haiti, Republic of" });
            States.Add(new State() { StateID = 96, CountryID = 7, StateName = "Heard Island and McDonald Islands" });
            States.Add(new State() { StateID = 97, CountryID = 2, StateName = "Holy See (Vatican City State)" });
            States.Add(new State() { StateID = 98, CountryID = 5, StateName = "Honduras, Republic of" });
            States.Add(new State() { StateID = 99, CountryID = 1, StateName = "Hong Kong, Special Administrative Region of China" });
            States.Add(new State() { StateID = 100, CountryID = 2, StateName = "Hungary, Republic of" });
            States.Add(new State() { StateID = 101, CountryID = 2, StateName = "Iceland, Republic of" });
            States.Add(new State() { StateID = 102, CountryID = 1, StateName = "India, Republic of" });
            States.Add(new State() { StateID = 103, CountryID = 1, StateName = "Indonesia, Republic of" });
            States.Add(new State() { StateID = 104, CountryID = 1, StateName = "Iran, Islamic Republic of" });
            States.Add(new State() { StateID = 105, CountryID = 1, StateName = "Iraq, Republic of" });
            States.Add(new State() { StateID = 106, CountryID = 2, StateName = "Ireland" });
            States.Add(new State() { StateID = 107, CountryID = 2, StateName = "Isle of Man" });
            States.Add(new State() { StateID = 108, CountryID = 1, StateName = "Israel, State of" });
            States.Add(new State() { StateID = 109, CountryID = 2, StateName = "Italy, Italian Republic" });
            States.Add(new State() { StateID = 110, CountryID = 5, StateName = "Jamaica" });
            States.Add(new State() { StateID = 111, CountryID = 1, StateName = "Japan" });
            States.Add(new State() { StateID = 112, CountryID = 2, StateName = "Jersey, Bailiwick of" });
            States.Add(new State() { StateID = 113, CountryID = 1, StateName = "Jordan, Hashemite Kingdom of" });
            States.Add(new State() { StateID = 114, CountryID = 1, StateName = "Kazakhstan, Republic of" });
            States.Add(new State() { StateID = 115, CountryID = 3, StateName = "Kenya, Republic of" });
            States.Add(new State() { StateID = 116, CountryID = 4, StateName = "Kiribati, Republic of" });
            States.Add(new State() { StateID = 117, CountryID = 1, StateName = "Korea, Democratic People's Republic of" });
            States.Add(new State() { StateID = 118, CountryID = 1, StateName = "Korea, Republic of" });
            States.Add(new State() { StateID = 119, CountryID = 1, StateName = "Kuwait, State of" });
            States.Add(new State() { StateID = 120, CountryID = 1, StateName = "Kyrgyz Republic" });
            States.Add(new State() { StateID = 121, CountryID = 1, StateName = "Lao People's Democratic Republic" });
            States.Add(new State() { StateID = 122, CountryID = 2, StateName = "Latvia, Republic of" });
            States.Add(new State() { StateID = 123, CountryID = 1, StateName = "Lebanon, Lebanese Republic" });
            States.Add(new State() { StateID = 124, CountryID = 3, StateName = "Lesotho, Kingdom of" });
            States.Add(new State() { StateID = 125, CountryID = 3, StateName = "Liberia, Republic of" });
            States.Add(new State() { StateID = 126, CountryID = 3, StateName = "Libyan Arab Jamahiriya" });
            States.Add(new State() { StateID = 127, CountryID = 2, StateName = "Liechtenstein, Principality of" });
            States.Add(new State() { StateID = 128, CountryID = 2, StateName = "Lithuania, Republic of" });
            States.Add(new State() { StateID = 129, CountryID = 2, StateName = "Luxembourg, Grand Duchy of" });
            States.Add(new State() { StateID = 130, CountryID = 1, StateName = "Macao, Special AdministrativeRegion of China" });
            States.Add(new State() { StateID = 131, CountryID = 2, StateName = "Macedonia, Republic of" });
            States.Add(new State() { StateID = 132, CountryID = 3, StateName = "Madagascar, Republic of" });
            States.Add(new State() { StateID = 133, CountryID = 3, StateName = "Malawi, Republic of" });
            States.Add(new State() { StateID = 134, CountryID = 1, StateName = "Malaysia" });
            States.Add(new State() { StateID = 135, CountryID = 1, StateName = "Maldives, Republic of" });
            States.Add(new State() { StateID = 136, CountryID = 3, StateName = "Mali, Republic of" });
            States.Add(new State() { StateID = 137, CountryID = 2, StateName = "Malta, Republic of" });
            States.Add(new State() { StateID = 138, CountryID = 4, StateName = "Marshall Islands, Republic ofthe" });
            States.Add(new State() { StateID = 139, CountryID = 5, StateName = "Martinique" });
            States.Add(new State() { StateID = 140, CountryID = 3, StateName = "Mauritania, Islamic Republicof" });
            States.Add(new State() { StateID = 141, CountryID = 3, StateName = "Mauritius, Republic of" });
            States.Add(new State() { StateID = 142, CountryID = 3, StateName = "Mayotte" });
            States.Add(new State() { StateID = 143, CountryID = 5, StateName = "Mexico, United Mexican States" });
            States.Add(new State() { StateID = 144, CountryID = 4, StateName = "Micronesia, Federated Statesof" });
            States.Add(new State() { StateID = 145, CountryID = 2, StateName = "Moldova, Republic of" });
            States.Add(new State() { StateID = 146, CountryID = 2, StateName = "Monaco, Principality of" });
            States.Add(new State() { StateID = 147, CountryID = 1, StateName = "Mongolia" });
            States.Add(new State() { StateID = 148, CountryID = 2, StateName = "Montenegro, Republic of" });
            States.Add(new State() { StateID = 149, CountryID = 5, StateName = "Montserrat" });
            States.Add(new State() { StateID = 150, CountryID = 3, StateName = "Morocco, Kingdom of" });
            States.Add(new State() { StateID = 151, CountryID = 3, StateName = "Mozambique, Republic of" });
            States.Add(new State() { StateID = 152, CountryID = 1, StateName = "Myanmar, Union of" });
            States.Add(new State() { StateID = 153, CountryID = 3, StateName = "Namibia, Republic of" });
            States.Add(new State() { StateID = 154, CountryID = 4, StateName = "Nauru, Republic of" });
            States.Add(new State() { StateID = 155, CountryID = 1, StateName = "Nepal, State of" });
            States.Add(new State() { StateID = 156, CountryID = 5, StateName = "Netherlands Antilles" });
            States.Add(new State() { StateID = 157, CountryID = 2, StateName = "Netherlands, Kingdom of the" });
            States.Add(new State() { StateID = 158, CountryID = 4, StateName = "New Caledonia" });
            States.Add(new State() { StateID = 159, CountryID = 4, StateName = "New Zealand" });
            States.Add(new State() { StateID = 160, CountryID = 5, StateName = "Nicaragua, Republic of" });
            States.Add(new State() { StateID = 161, CountryID = 3, StateName = "Niger, Republic of" });
            States.Add(new State() { StateID = 162, CountryID = 3, StateName = "Nigeria, Federal Republic of" });
            States.Add(new State() { StateID = 163, CountryID = 4, StateName = "Niue" });
            States.Add(new State() { StateID = 164, CountryID = 4, StateName = "Norfolk Island" });
            States.Add(new State() { StateID = 165, CountryID = 4, StateName = "Northern Mariana Islands, Commonwealth of the" });
            States.Add(new State() { StateID = 166, CountryID = 2, StateName = "Norway, Kingdom of" });
            States.Add(new State() { StateID = 167, CountryID = 1, StateName = "Oman, Sultanate of" });
            States.Add(new State() { StateID = 168, CountryID = 1, StateName = "Pakistan, Islamic Republic of" });
            States.Add(new State() { StateID = 169, CountryID = 4, StateName = "Palau, Republic of" });
            States.Add(new State() { StateID = 170, CountryID = 1, StateName = "Palestinian Territory, Occupied" });
            States.Add(new State() { StateID = 171, CountryID = 5, StateName = "Panama, Republic of" });
            States.Add(new State() { StateID = 172, CountryID = 4, StateName = "Papua New Guinea, IndependentState of" });
            States.Add(new State() { StateID = 173, CountryID = 6, StateName = "Paraguay, Republic of" });
            States.Add(new State() { StateID = 174, CountryID = 6, StateName = "Peru, Republic of" });
            States.Add(new State() { StateID = 175, CountryID = 1, StateName = "Philippines, Republic of the" });
            States.Add(new State() { StateID = 176, CountryID = 4, StateName = "Pitcairn Islands" });
            States.Add(new State() { StateID = 177, CountryID = 2, StateName = "Poland, Republic of" });
            States.Add(new State() { StateID = 178, CountryID = 2, StateName = "Portugal, Portuguese Republic" });
            States.Add(new State() { StateID = 179, CountryID = 5, StateName = "Puerto Rico, Commonwealth of" });
            States.Add(new State() { StateID = 180, CountryID = 1, StateName = "Qatar, State of" });
            States.Add(new State() { StateID = 181, CountryID = 3, StateName = "Reunion" });
            States.Add(new State() { StateID = 182, CountryID = 2, StateName = "Romania" });
            States.Add(new State() { StateID = 183, CountryID = 2, StateName = "Russian Federation" });
            States.Add(new State() { StateID = 184, CountryID = 3, StateName = "Rwanda, Republic of" });
            States.Add(new State() { StateID = 185, CountryID = 5, StateName = "Saint Barthelemy" });
            States.Add(new State() { StateID = 186, CountryID = 3, StateName = "Saint Helena" });
            States.Add(new State() { StateID = 187, CountryID = 5, StateName = "Saint Kitts and Nevis, Federation of" });
            States.Add(new State() { StateID = 188, CountryID = 5, StateName = "Saint Lucia" });
            States.Add(new State() { StateID = 189, CountryID = 5, StateName = "Saint Martin" });
            States.Add(new State() { StateID = 190, CountryID = 5, StateName = "Saint Pierre and Miquelon" });
            States.Add(new State() { StateID = 191, CountryID = 5, StateName = "Saint Vincent and the Grenadines" });
            States.Add(new State() { StateID = 192, CountryID = 4, StateName = "Samoa, Independent State of" });
            States.Add(new State() { StateID = 193, CountryID = 2, StateName = "San Marino, Republic of" });
            States.Add(new State() { StateID = 194, CountryID = 3, StateName = "Sao Tome and Principe, Democratic Republic of" });
            States.Add(new State() { StateID = 195, CountryID = 1, StateName = "Saudi Arabia, Kingdom of" });
            States.Add(new State() { StateID = 196, CountryID = 3, StateName = "Senegal, Republic of" });
            States.Add(new State() { StateID = 197, CountryID = 2, StateName = "Serbia, Republic of" });
            States.Add(new State() { StateID = 198, CountryID = 3, StateName = "Seychelles, Republic of" });
            States.Add(new State() { StateID = 199, CountryID = 3, StateName = "Sierra Leone, Republic of" });
            States.Add(new State() { StateID = 200, CountryID = 1, StateName = "Singapore, Republic of" });
            States.Add(new State() { StateID = 201, CountryID = 2, StateName = "Slovakia (Slovak Republic)" });
            States.Add(new State() { StateID = 202, CountryID = 2, StateName = "Slovenia, Republic of" });
            States.Add(new State() { StateID = 203, CountryID = 4, StateName = "Solomon Islands" });
            States.Add(new State() { StateID = 204, CountryID = 3, StateName = "Somalia, Somali Republic" });
            States.Add(new State() { StateID = 205, CountryID = 3, StateName = "South Africa, Republic of" });
            States.Add(new State() { StateID = 206, CountryID = 7, StateName = "South Georgia and the South Sandwich Islands" });
            States.Add(new State() { StateID = 207, CountryID = 2, StateName = "Spain, Kingdom of" });
            States.Add(new State() { StateID = 208, CountryID = 1, StateName = "Sri Lanka, Democratic Socialist Republic of" });
            States.Add(new State() { StateID = 209, CountryID = 3, StateName = "Sudan, Republic of" });
            States.Add(new State() { StateID = 210, CountryID = 6, StateName = "Suriname, Republic of" });
            States.Add(new State() { StateID = 211, CountryID = 2, StateName = "Svalbard & Jan Mayen Islands" });
            States.Add(new State() { StateID = 212, CountryID = 3, StateName = "Swaziland, Kingdom of" });
            States.Add(new State() { StateID = 213, CountryID = 2, StateName = "Sweden, Kingdom of" });
            States.Add(new State() { StateID = 214, CountryID = 2, StateName = "Switzerland, Swiss Confederation" });
            States.Add(new State() { StateID = 215, CountryID = 1, StateName = "Syrian Arab Republic" });
            States.Add(new State() { StateID = 216, CountryID = 1, StateName = "Taiwan" });
            States.Add(new State() { StateID = 217, CountryID = 1, StateName = "Tajikistan, Republic of" });
            States.Add(new State() { StateID = 218, CountryID = 3, StateName = "Tanzania, United Republic of" });
            States.Add(new State() { StateID = 219, CountryID = 1, StateName = "Thailand, Kingdom of" });
            States.Add(new State() { StateID = 220, CountryID = 1, StateName = "Timor-Leste, Democratic Republic of" });
            States.Add(new State() { StateID = 221, CountryID = 3, StateName = "Togo, Togolese Republic" });
            States.Add(new State() { StateID = 222, CountryID = 4, StateName = "Tokelau" });
            States.Add(new State() { StateID = 223, CountryID = 4, StateName = "Tonga, Kingdom of" });
            States.Add(new State() { StateID = 224, CountryID = 5, StateName = "Trinidad and Tobago, Republicof" });
            States.Add(new State() { StateID = 225, CountryID = 3, StateName = "Tunisia, Tunisian Republic" });
            States.Add(new State() { StateID = 226, CountryID = 1, StateName = "Turkey, Republic of" });
            States.Add(new State() { StateID = 227, CountryID = 1, StateName = "Turkmenistan" });
            States.Add(new State() { StateID = 228, CountryID = 5, StateName = "Turks and Caicos Islands" });
            States.Add(new State() { StateID = 229, CountryID = 4, StateName = "Tuvalu" });
            States.Add(new State() { StateID = 230, CountryID = 3, StateName = "Uganda, Republic of" });
            States.Add(new State() { StateID = 231, CountryID = 2, StateName = "Ukraine" });
            States.Add(new State() { StateID = 232, CountryID = 1, StateName = "United Arab Emirates" });
            States.Add(new State() { StateID = 233, CountryID = 2, StateName = "United Kingdom of Great Britain & Northern Ireland" });
            States.Add(new State() { StateID = 234, CountryID = 5, StateName = "United States of America" });
            States.Add(new State() { StateID = 235, CountryID = 4, StateName = "United States Minor OutlyingIslands" });
            States.Add(new State() { StateID = 236, CountryID = 5, StateName = "United States Virgin Islands" });
            States.Add(new State() { StateID = 237, CountryID = 6, StateName = "Uruguay, Eastern Republic of" });
            States.Add(new State() { StateID = 238, CountryID = 1, StateName = "Uzbekistan, Republic of" });
            States.Add(new State() { StateID = 239, CountryID = 4, StateName = "Vanuatu, Republic of" });
            States.Add(new State() { StateID = 240, CountryID = 6, StateName = "Venezuela, Bolivarian Republic of" });
            States.Add(new State() { StateID = 241, CountryID = 1, StateName = "Vietnam, Socialist Republic of" });
            States.Add(new State() { StateID = 242, CountryID = 4, StateName = "Wallis and Futuna" });
            States.Add(new State() { StateID = 243, CountryID = 3, StateName = "Western Sahara" });
            States.Add(new State() { StateID = 244, CountryID = 1, StateName = "Yemen" });
            States.Add(new State() { StateID = 245, CountryID = 3, StateName = "Zambia, Republic of" });
            States.Add(new State() { StateID = 246, CountryID = 3, StateName = "Zimbabwe, Republic of" });
        }
    }
    #endregion
}
My VIEW Looks Like this (CustomerView.XAML):
<UserControl x:Class="SilverlightWithWCFService.View.CustomerView"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    mc:Ignorable="d"   xmlns:View="clr-namespace:SilverlightWithWCFService.Model"
    xmlns:telerik="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.GridView"
    d:DesignHeight="300" d:DesignWidth="400">
    <UserControl.DataContext>
        <View:CustomerViewModel   />
    </UserControl.DataContext>
    <UserControl.Resources>
        <View:CustomerViewModel x:Key="MyViewModel" />
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot">

        <Grid.RowDefinitions>
            <RowDefinition Height="400" />
            <RowDefinition Height="50" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <telerik:RadGridView x:Name="CustomerGrid" AutoGenerateColumns="False" Grid.Row="0" ItemsSource="{Binding objSearchList}">
            <telerik:RadGridView.Columns>
                <telerik:GridViewDataColumn DataMemberBinding="{Binding CustomerID,Mode=TwoWay}" />
                <telerik:GridViewDataColumn DataMemberBinding="{Binding CompanyName,Mode=TwoWay}" />
                <telerik:GridViewDataColumn DataMemberBinding="{Binding ContactName,Mode=TwoWay}" />
                <telerik:GridViewComboBoxColumn 
                    DataMemberBinding="{Binding Country,Mode=TwoWay}" 
                    Header="Country"
                    DisplayMemberPath="CountryName" SelectedValueMemberPath="CountryID" 
                    ItemsSourceBinding="{Binding CountryList, Source={StaticResource MyViewModel}}" />
                <telerik:GridViewComboBoxColumn  
                    DataMemberBinding="{Binding State,Mode=TwoWay}" 
                    Header="State" 
                    DisplayMemberPath="StateName" SelectedValueMemberPath="StateID"
                    ItemsSourceBinding="{Binding StateList, Source={StaticResource MyViewModel}}" 
                     />
                <!--<telerik:GridViewComboBoxColumn  ItemsSourceBinding="{Binding AvailableState}" DataMemberBinding="{Binding State}" Header="State" DisplayMemberPath="StateName" SelectedValueMemberPath="StateID" />-->
                <!--<telerik:GridViewComboBoxColumn  ItemsSourceBinding="{Binding AvailableState}" DataMemberBinding="{Binding State}" Header="State" DisplayMemberPath="StateName" SelectedValueMemberPath="StateID" />-->
            </telerik:RadGridView.Columns>
        </telerik:RadGridView>
        <Button Grid.Row="1" Height="25" Width="50" HorizontalAlignment="Center" Content="Add" Click="Button_Click" />
    </Grid>
</UserControl>

My VIEW .CS Looks Like this (CustomerView.XAML.CS):
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using SilverlightWithWCFService.Model;
using Telerik.Windows.Controls;
using Telerik.Windows;
namespace SilverlightWithWCFService.View
{
    public partial class CustomerView : UserControl
    {
        CustomerViewModel cvm = new CustomerViewModel();
        public CustomerView()
        {
            InitializeComponent();
            this.AddHandler(RadComboBox.SelectionChangedEvent, new Telerik.Windows.Controls.SelectionChangedEventHandler(comboSelectionChanged));
        }
        void comboSelectionChanged(object sender, RadRoutedEventArgs args)
        {
            RadComboBox comboBox = (RadComboBox)args.OriginalSource;
            if (comboBox.SelectedValue == null || comboBox.SelectedValuePath != "CountryID")
            {
                return;
            }
            CustromerList custList = comboBox.DataContext as CustromerList;
            custList.Country = (Int32)comboBox.SelectedValue;
            cvm.CID = custList.Country;
        }
        private void Button_Click(object sender, RoutedEventArgs e)
        {
        }
    }
}
Posted

Please Change in This Class:

CustromerList
Add This Properties:

XML
private IEnumerable<State> availableStateList;
        public IEnumerable<State> AvailableStateList
        {
            get
            {
                this.availableStateList = from c in AllLocations.States
                                          where c.CountryID == this.Country
                                          select c;
                return this.availableStateList;
            }
            set
            {
                this.availableStateList = value;
                this.OnPropertyChanged("AvailableStateList");
            }
        }




IN Constructor
public CustomerViewModel()


C#
for (int i = 1; i <= 10; i++)
            {
                objsearchList.Add(new CustromerList()
                {
                    CustomerID = i,
                    CompanyName = i.ToString(),
                    ContactName = i.ToString(),
                    Country = 1,
                    State = 1,
                    AvailableStateList = from c in AllLocations.States
                                         where c.CountryID == 1
                                         select c
                });

                objSearchList = objsearchList;

            }




In .XAML File

CSS
<telerik:GridViewComboBoxColumn
                  DataMemberBinding="{Binding State,Mode=TwoWay}"
                  Header="State"
                  DisplayMemberPath="StateName" SelectedValueMemberPath="StateID"
                  ItemsSourceBinding="{Binding AvailableStateList}"
                   />



Also Remove StateList And CID Properties.
If Add City List then add This code

Create Class for City
public class City
  {
      public int CityID { get; set; }
      public string CityName { get; set; }
      public int StateID { get; set; }
  }



IN CustromerList Class Add properties
C#
private int? state;
       public int? State
       {
           get
           {
               return this.state;
           }
           set
           {
               if (this.state != value)
               {
                   this.state = value;
                   this.OnPropertyChanged("State");
                   this.City = null;
               }
           }
       }
       private int? city;
       public int? City
       {
           get
           {
               return this.city;
           }
           set
           {
               if (this.city != value)
               {
                   this.city = value;
                   this.OnPropertyChanged("City");
               }
           }
       }


XML
private IEnumerable<City> availableCityList;
       public IEnumerable<City> AvailableCityList
       {
           get
           {
               this.availableCityList = from c in AllLocations.Citys
                                        where c.StateID == this.State
                                        select c;
               return this.availableCityList;
           }
           set
           {
               this.availableCityList = value;
               this.OnPropertyChanged("AvailableCityList");
           }
       }


In AllLocations Class Add


public static List<city> Citys;

C#
Citys = new List<City>();
           Citys.Add(new City() { CityID = 1, StateID = 1, CityName = "AA" });
           Citys.Add(new City() { CityID = 2, StateID = 2, CityName = "BB" });
           Citys.Add(new City() { CityID = 3, StateID = 3, CityName = "CC" });
           Citys.Add(new City() { CityID = 4, StateID = 4, CityName = "DD" });
           Citys.Add(new City() { CityID = 5, StateID = 5, CityName = "EE" });
           Citys.Add(new City() { CityID = 6, StateID = 6, CityName = "FF" });
           Citys.Add(new City() { CityID = 7, StateID = 7, CityName = "GG" });
           Citys.Add(new City() { CityID = 8, StateID = 8, CityName = "HH" });
           Citys.Add(new City() { CityID = 9, StateID = 9, CityName = "JJ" });
           Citys.Add(new City() { CityID = 10, StateID = 10, CityName = "KK" });


In CustomerViewModel Constrictor

C#
for (int i = 1; i <= 10; i++)
            {
                objsearchList.Add(new CustromerList()
                {
                    CustomerID = i,
                    CompanyName = i.ToString(),
                    ContactName = i.ToString(),
                    Country = 1,
                    State = 1,
                    City=1,
                    AvailableStateList = from c in AllLocations.States
                                         where c.CountryID == 1
                                         select c,
                    AvailableCityList = from c in AllLocations.Citys
                                        where c.StateID == 1
                                        select c
                });

In .XAML File Add Columns


CSS
<telerik:GridViewComboBoxColumn
                   DataMemberBinding="{Binding City,Mode=TwoWay}"
                   Header="City"
                   DisplayMemberPath="CityName" SelectedValueMemberPath="CityID"
                   ItemsSourceBinding="{Binding AvailableCityList}"
                    />


If Add Command In Button Click


C#
#region Command
   public class GenricCommand : ICommand
   {
       CustomerViewModel _vm;
       public GenricCommand(CustomerViewModel vm)
       {
           _vm = vm;
       }

       public bool CanExecute(object parameter)
       {
           return true;

       }

       public event EventHandler CanExecuteChanged;

       public void Execute(object parameter)
       {
           _vm.SaveContact();
       }

   }
   #endregion

In View Model Add This Properties

C#
public ICommand GetContact
        {
            get { return new GenricCommand(this); }
        }
        public void SaveContact()
        {

            foreach (CustromerList item in objSearchList)
            {
                CustromerList c = new CustromerList();
                c = item;
            }
        }


In .XAML File Add Button
<Button Grid.Row="1" Height="25" Width="50" HorizontalAlignment="Center" Content="Add" Command="{Binding GetContact}" />
 
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v2
If you want to use serialization then follow this...


Add Reference "using System.Runtime.Serialization;" and Make all BatabaseObject like this.

C#
[DataContract()]
   public class Customer
   {
       [DataMember]
       public int CustomerName { get; set; }
       [DataMember]
       public string CompanyName { get; set; }
       [DataMember]
       public string ContactName { get; set; }
   }
 
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