nullreferenceexception was unhandled by user code

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C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

using System.ComponentModel;
using System.Text.RegularExpressions;
using System.Numerics;
using System.Globalization;

namespace RMS
{
    public class CustomerVldtionCls: IDataErrorInfo
    {
        private Int64 _accountNo;

        private string _nameString;
        private string _name;
        private string _fname;
        
        private Int64 _cardNo;
        private string _date;
        private string _contactNo;
        private Int64 _residenceNo;
        

        private string _address;
        private string _city;
        private string _country;
        
        private string _transType;
        private Int64 _intAmount;
        private string _remarks;

        private string _decimalAmount;
        private int _charges;

        private string _currencyRate;
        private string _cmbToBeneficiary;
        private string _cmbAgent;
        private string _cmbBranch;

        private Int64 _fax;
        private string _email;

        private string _bankName;
        private string _accountName;

        private string _cmbText;
        //private Int64 _password;
        private string _password;
        private Int64 _newPassword;

        Regex regString = new Regex("^[a-zA-Z ]+$");
        Regex regAddress = new Regex("^[a-zA-Z0-9#/.&(), ]+$");
        Regex regAmount = new Regex("^[0-9.]+$");
        Regex regNumber = new Regex("^[0-9]+$");

        Regex regEmail = new Regex(@"^([a-zA-Z0-9_\-\.]+)@((\[[0-9]{1,3}" +
        @"\.[0-9]{1,3}\.[0-9]{1,3}\.)|(([a-zA-Z0-9\-]+\" +
        @".)+))([a-zA-Z]{2,4}|[0-9]{1,3})(\]?)$");


        public Int64 AccountNo
        {
            get { return _accountNo; }
            set { _accountNo = value; }
        }
        public string NameString
        {
            get { return _nameString; }
            set { _nameString = value; }
        }
        public string Name
        {
            get { return _name; }
            set { _name = value; }
        }
        public string FName
        {
            get { return _fname; }
            set { _fname = value; }
        }
        public Int64 CardNo
        {
            get { return _cardNo; }
            set { _cardNo = value; }
        }
        public String Date
        {
            get { return _date; }
            set { _date = value; }
        }
        public string ContactNo
        {
            get { return _contactNo; }
            set { _contactNo = value; }
        }
        public Int64 ResidenceNo
        {
            get { return _residenceNo; }
            set { _residenceNo = value; }
        }
        public string Address
        {
            get { return _address; }
            set { _address = value; }
        }
        public string City
        {
            get { return _city; }
            set { _city = value; }
        }
        public string Country
        {
            get { return _country; }
            set { _country = value; }
        }
        public string TransectionType
        {
            get { return _transType; }
            set { _transType = value; }
        }
        public Int64 Amount
        {
            get { return _intAmount; }
            set { _intAmount = value; }
        }
        public string Remarks
        {
            get { return _remarks; }
            set { _remarks = value; }
        }

        public string DecimalAmount
        {
            get { return _decimalAmount; }
            set { _decimalAmount = value; }
        }
        public int Charges
        {
            get { return _charges; }
            set { _charges = value; }
        }
        public string CurrencyRate
        {
            get { return _currencyRate; }
            set { _currencyRate = value; }
        }
        public string CmbToBeneficiary
        {
            get { return _cmbToBeneficiary; }
            set { _cmbToBeneficiary = value; }
        }
        public string CmbAgent
        {
            get { return _cmbAgent; }
            set { _cmbAgent = value; }
        }
        public string CmbBranch
        {
            get { return _cmbBranch; }
            set { _cmbBranch = value; }
        }
        public Int64 FaxNo
        {
            get { return _fax; }
            set { _fax = value; }
        }
        public string Email
        {
            get { return _email; }
            set { _email = value; }
        }
        public string BankName
        {
            get { return _bankName; }
            set { _bankName = value; }
        }
        public string BankAccountName
        {
            get { return _accountName; }
            set { _accountName = value; }
        }
        public string CmbText
        {
            get { return _cmbText; }
            set { _cmbText = value; }
        }
        //public Int64 Password
        public string Password
        {
            get { return _password; }
            set { _password = value; }
        }
        public Int64 NewPassword
        {
            get { return _newPassword; }
            set { _newPassword = value; }
        }
        
        public string Error
        {
            get
            {
                return this[string.Empty];
            }
        }
        public string this[string propertyName]
        {

            get
            {
                string result = string.Empty;

                if (propertyName == string.Empty || propertyName == "AccountNo")
                {
                    if (AccountNo == 0)
                    {
                        result = "Account No. cannot be left blank or Invalid value is  entered";
                    }
                    else if ((AccountNo.ToString().Length > 0) && (AccountNo.ToString().Length > 16))
                    {
                        result = "Account No. can't be more than 16 digit number";
                    }
                    else
                    { }

                }
                if (propertyName == string.Empty || propertyName == "NameString")
                {
                    if (string.IsNullOrEmpty(this.NameString))
                    {
                        result = "Value cannot be blank!";
                    }
                    else if (!(regString.IsMatch(this.NameString)))
                    {
                        result = "Value should be only character value from (a-z or A-Z or Space)";
                    }
                    else if ((regString.IsMatch(this.NameString)) && (string.IsNullOrEmpty(this.NameString)) == false && (NameString.Length < 3 || NameString.Length > 200))
                    {
                        result = "Too short or Too longe value";
                    }
                    else { }
                }

                if (propertyName == string.Empty || propertyName == "Name")
                {
                    if (string.IsNullOrEmpty(this.Name))
                    {
                        result = "Name cannot be blank!";
                    }
                    else if (!(regString.IsMatch(this.Name)))
                    {
                        result = "Name should be only character value from (a-z or A-Z or Space)";
                    }
                    else if ((regString.IsMatch(this.Name)) && (string.IsNullOrEmpty(this.Name)) == false && (Name.Length < 3 || Name.Length > 200))
                    {
                        result = "Too short or Too longe Name length";
                    }   
                    else { }
               }

               if (propertyName == string.Empty || propertyName == "FName")
               {
                   if (string.IsNullOrEmpty(this.FName))
                    {
                        result = "Father Name cannot be blank!";
                    }
                    else if (!(regString.IsMatch(this.FName)))
                    {
                        result = "Father Name should be only character value from (a-z or A-Z or Space)";
                    }
                   else if ((regString.IsMatch(this.FName)) && (string.IsNullOrEmpty(this.FName)) == false && (FName.Length < 3 || FName.Length > 200))
                   {
                       result = "Too short or Too longe Name length";
                   }   
                    else { }
               }

               if (propertyName == string.Empty || propertyName == "CardNo")
               {
                   if (CardNo == 0)
                   {
                       result = "Value. cannot be left blank or Invalid value is entered";
                   }
                   else if ((CardNo.ToString().Length >0) && (CardNo.ToString().Length > 16))
                   {
                       result = "Value. can't be more than 16 digit number";
                   }
                   else
                   { }
                      
               }
               if (propertyName == string.Empty || propertyName == "MyDate")
               {
                   DateTime expDat;

                   if (string.IsNullOrEmpty(this.Date))
                   {
                       //result = "Date Field is required";    
                   }
                   else if ((DateTime.TryParse(this.Date, out expDat)))
                   {
                       if (expDat < DateTime.Now)
                           result = "Expiry date must be greater than current date";
                   }
                   //else if(!(DateTime.TryParseExact(this.Date, "d/M/yyyy", CultureInfo.InvariantCulture, DateTimeStyles.AdjustToUniversal, out this.dateResult)))
                   //{
                   //    result = "Invalid Date";
                   //}
                   else
                   { }

               }
               if (propertyName == string.Empty || propertyName == "ResidNo")
               {
                   //if (ResidenceNo == 0)
                   //{
                   //    result = "Residence No. value cannot be '0' or Invalid value is entered";
                   //}
                   //else
                   //{ }
               }

               if (propertyName == string.Empty || propertyName == "ContactNo")
               {
                   if (string.IsNullOrEmpty(this.ContactNo))
                   {
                       result = "Value can't be left blank";
                   }
                   else if (this.ContactNo.ToString().Length < 7)
                   {
                       result = "Value must be more than 7 digit number";
                   }
                   else if ((ContactNo.ToString().Length > 0) && (ContactNo.ToString().Length > 17))
                   {
                       result = "Value must be in between 7 to 16 digit number";
                   }
                   else { }
                  
               }
               if (propertyName == string.Empty || propertyName == "Address")
               {
                   if (string.IsNullOrEmpty(this.Address))
                   {
                       result = "Address cannot be blank!";
                   }
                   else if (!(regAddress.IsMatch(this.Address)))
                   {
                       result = "Address should be only character value from (a-z or A-Z or 0-9 or # / . , & () or Space)";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "City")
               {
                   if (string.IsNullOrEmpty(City))
                   {
                       result = "City must be select!";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "Country")
               {
                   if (string.IsNullOrEmpty(Country))
                   {
                       result = "Country Value must be select!";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "TransectionType")
               {
                   if (string.IsNullOrEmpty(TransectionType))
                   {
                       result = "Transection Type must be select!";
                   }
                   else { }
               }
             
               if (propertyName == string.Empty || propertyName == "Remarks")
               {
                   if (string.IsNullOrEmpty(this.Remarks))
                   {

                   }
                   else if (!(regAddress.IsMatch(this.Remarks)))
                    {
                        result = "Remarks should be only character value from (a-z or A-Z or 0-9 or # / . , & () or Space)";
                    }
                    else { }
               }
               if (propertyName == string.Empty || propertyName == "Amount")
               {
                   if (this.Amount == 0)
                   {
                       result = "Amount cannot be left blank or zero or Invalid value is entered";
                   }
                   else if (this.Amount < 0)
                   {
                       result = "Amount must greater than 0";
                   }
                   else if ((Amount.ToString().Length > 0) && (Amount.ToString().Length > 17))
                   {
                       result = "Amount can't be more than 17 digit number at once";
                   }
                   else { }

               }
               if (propertyName == string.Empty || propertyName == "DecimalAmount")
               {
                   if (string.IsNullOrEmpty(this.DecimalAmount))
                   {
                       result = "Value can't be left blank";
                   }
                   else if ((DecimalAmount.ToString().Length > 0) && (DecimalAmount.ToString().Length > 17))
                   {
                       result = "Amount can't be more than 17 digit number at once";
                   }
                   else { }

               }
              
               if (propertyName == string.Empty || propertyName == "Charges")
               {
                   
                   if (this.Charges == 0)
                   {
                       
                   }
                   else if (this.Charges < 0)
                   {
                       result = "Charges must '0' or greater than  '0'";
                   }
                   else if (this.Charges > 0)
                   {
                       if ((Charges.ToString().Length > 0) && (Charges.ToString().Length > 17))
                       {
                           result = "Charges can't be more than 17 digit number at once";
                       }
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "CurrencyRate")
               {
                   decimal rate = 0;
                   if (string.IsNullOrEmpty(this.CurrencyRate))
                   {
                       result = "Rate can't be left blank";
                   }
                   else if (this.CurrencyRate.ToString() == "0")
                   {
                       result = "Rate can't be '0'";
                   }
                   else if (!(string.IsNullOrEmpty(this.CurrencyRate)))
                   {
                       if (decimal.TryParse(this.CurrencyRate, out rate))
                       {
                           if (rate == 0)
                           {
                               result = "Rate can't be '0'";
                           }
                       }
                   }
                   else if ((CurrencyRate.ToString().Length > 0) && (CurrencyRate.ToString().Length > 17))
                   {
                       result = "Rate can't be more than 17 digit number at once";
                   }
                   else { }

               }
               if (propertyName == string.Empty || propertyName == "CmbToBeneficiary")
               {
                   if (string.IsNullOrEmpty(CmbToBeneficiary))
                   {
                       result = "To Beneficiary must be select";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "CmbAgent")
               {
                   if (string.IsNullOrEmpty(CmbAgent))
                   {
                       result = "Agent must be select";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "CmbBranch")
               {
                   if (string.IsNullOrEmpty(CmbBranch))
                   {
                       result = "Branch must be select";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "FaxNo")
               {
                   if (FaxNo == 0)
                   {
                       //result = "Fax No can't be left blanck or Invalid value is entered";
                   }
                   else if (FaxNo.ToString().Length < 7)
                   {
                       result = "Fax No. must be at least 7 digit number";
                   }
                   else if ((FaxNo.ToString().Length >= 7) && (FaxNo.ToString().Length > 16))
                   {
                       result = "FaxNo No. can't be more than 16 digit number";
                   }
                   else if (!(regNumber.IsMatch(FaxNo.ToString())))
                   {
                       result = "Fax No. is Invalid.";
                   }
                   else
                   { }
               }
               if (propertyName == string.Empty || propertyName == "Email")
               {
                   if (string.IsNullOrEmpty(Email))
                   {
                       result = "Email is manadatory";
                   }
                   else if(!(regEmail.IsMatch(Email)))
                   {
                       result = "Invalid Email";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "Name")
               {
                   if (string.IsNullOrEmpty(this.Name))
                   {
                       result = "Name cannot be blank!";
                   }
                   else if (!(regString.IsMatch(this.Name)))
                   {
                       result = "Name should be only character value from (a-z or A-Z or Space)";
                   }
                   else if ((regString.IsMatch(this.Name)) && (string.IsNullOrEmpty(this.Name)) == false && (Name.Length < 3 || Name.Length > 200))
                   {
                       result = "Too short or Too longe Name length";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "BankName")
               {
                   if (string.IsNullOrEmpty(this.BankName))
                   {
                       result = "Bank Name cannot be blank!";
                   }
                   else if (!(regString.IsMatch(this.BankName)))
                   {
                       result = "Bank Name should be only character value from (a-z or A-Z or Space)";
                   }
                   else if ((regString.IsMatch(this.BankName)) && (string.IsNullOrEmpty(this.BankName)) == false && (BankName.Length < 3 || BankName.Length > 200))
                   {
                       result = "Too short or Too longe Name length";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "BankAccountName")
               {
                   if (string.IsNullOrEmpty(this.BankAccountName))
                   {
                       result = "Account Name cannot be blank!";
                   }
                   else if (!(regString.IsMatch(this.BankAccountName)))
                   {
                       result = "Account Name should be only character value from (a-z or A-Z or Space)";
                   }
                   else if ((regString.IsMatch(this.BankAccountName)) && (string.IsNullOrEmpty(this.BankAccountName)) == false && (BankAccountName.Length < 3 || BankAccountName.Length > 200))
                   {
                       result = "Too short or Too longe Name length";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "CmbText")
               {

                   if (string.IsNullOrEmpty(CmbText))
                   {
                       result = "Must be select value!";
                   }
                   else { }
               }
               if (propertyName == string.Empty || propertyName == "Password")
               {
                   
                   //if ( Password == 0)
                   if (Password == "")
                   { 
                       result = "Password cannot be left blank or Invalid value is entered";
                   }
                   //else if (Password.ToString().Length < 6)
                       
                   else if (Password.Length < 6)
                   {
                       result = "Password must be at least 6 digit number";
                   }
                    else if ((Password.ToString().Length >= 6) && (Password.ToString().Length > 16))
                   {
                       result = "Password can't be more than 16 digit number";
                   }
                   else
                   { }
               }
               if (propertyName == string.Empty || propertyName == "NewPassword")
               {
                   if (NewPassword == 0)
                   {
                       result = "Password cannot be left blank or Invalid value is entered";
                   }
                   else if (NewPassword.ToString().Length < 6)
                   {
                       result = "Password must be at least 6 digit number";
                   }
                   else if ((NewPassword.ToString().Length >= 6) &&   (NewPassword.ToString().Length > 16))
                   {
                       result = "Password can't be more than 16 digit number";
                   }
                   else
                   { }
               }

                return result;
            }
        }

    }
}

Posted 28-Mar-14 22:42pm

SADIQ BJ

Updated 29-Mar-14 0:10am

Mike Meinz

v3

Add a Solution

Comments

Mehdi Gholam 29-Mar-14 4:46am

Run your code in the debugger and see where the exception happens.

Richard MacCutchan 29-Mar-14 4:49am

Where do you initialise the value of Password?

SADIQ BJ 29-Mar-14 6:06am

the exception raised at else if (Password.Length < 6). Please help me

OriginalGriff 29-Mar-14 5:16am

Perhaps if you show us the whole property code instead of a fragment, and tell us which line you get the error on it would help? At the moment, I know there is more code there, since you are missing the property get part at the top, and the return part at the bottom - so the problem may be in the code you haven't provided.
Use the "Improve question" widget to edit your question and provide better information.

SADIQ BJ 29-Mar-14 6:05am

Now i have posted the whole code please check it..And the exception raised at
else if (Password.Length < 6).
Please help me

SADIQ BJ 29-Mar-14 7:15am

Ang this is my register new user code but here the add button is disabled. whats the problem..Means i have called that validation class in my register new user form:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;

using System.Data.SqlClient;
using System.Configuration;
using System.Data;
using RMSLibrary;
namespace RMS
{
///

/// Interaction logic for RegisterUser.xaml
///

public partial class RegisterUser : Window
{
string str = ConfigurationManager.ConnectionStrings["RMSDatabaseSqlProvider"].ConnectionString;

public RegisterUser()
{
InitializeComponent();
LoadGbBranch();
SetGbBranch();

}
private void LoadGbBranch()
{
SqlConnection cn = new SqlConnection();
cn.ConnectionString = str;
try
{
cn.Open();

string sql3 = string.Format("SELECT * FROM GbTradBranch");
SqlDataAdapter sda3 = new SqlDataAdapter(sql3, cn);
DataSet ds3 = new DataSet();

sda3.Fill(ds3);
cmbGbBranch.ItemsSource = ds3.Tables[0].DefaultView;
cmbGbBranch.DisplayMemberPath = ds3.Tables[0].Columns["Name"].ToString();
cn.Close();

}
catch (Exception ex)
{
MyErrorMessage(ex);
}
finally
{
cn.Close();
}
}
private void SetGbBranch()
{
if (GlobalClass.GbBranchID == 12)
{
lblGbBranch.Visibility = System.Windows.Visibility.Visible;
cmbGbBranch.Visibility = System.Windows.Visibility.Visible;
}
else
{
cmbType.SelectedIndex = 0;
cmbType.IsEnabled = false;
}
}

private void RegisterNewUser_CanExecute(object sender, CanExecuteRoutedEventArgs e)
{
bool hasError = Validation.GetHasError(tbUName) ||
Validation.GetHasError(cmbType) ||
Validation.GetHasError(tbPassword) ||
Validation.GetHasError(cmbGbBranch);

e.CanExecute = !hasError;

}
private void RegisterNewUser_Executed(object sender, ExecutedRoutedEventArgs e)
{
int GbBranchId = GlobalClass.GbBranchID;
try
{

if (cmbGbBranch.Visibility == System.Windows.Visibility.Visible)
{
GbBranchId = int.Parse(((DataRowView)cmbGbBranch.SelectedItem).Row.ItemArray[0].ToString());
}
}
catch (Exception ex)
{ this.MyErrorMessage(ex); }

if (cmbType.Text == "Admin")
{
if (!(CheckAlreadyExistUser(GbBranchId)))
{
if (!(CheckAlreadyExistAdmin(GbBranchId)))
{
RegisterNewUserOrAdmin(GbBranchId);
}
else
{
string messageBoxText = "Admin for selected branch already exist. You can't created two Admin's for single branch";
string caption = "Error";
MessageBoxButton button = MessageBoxButton.OK;
MessageBoxImage icon = MessageBoxImage.Error;
MessageBox.Show(messageBoxText, caption, button, icon);
}
}
else
{
stri

2 solutions

Solution 2

Debug to figure out which lines throw an error.
Ensure your objects are initialized.

Find out more about this exception here[^].

Posted 29-Mar-14 0:15am

Abhinav S

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OriginalGriff · Accepted Answer · 2014-03-29T00:10:00

Solution 1

"Now i have posted the whole code please check it..And the exception raised at

C#

else if (Password.Length < 6).

Please help me"

Why didn't you tell us that before? We don't need the code to tell you what the problem, is:
Password contains null - because you have not set a default value fro it.
In your constructor, add the line:

C#

Password = "";

And your problem will go away!

Posted 29-Mar-14 0:10am

OriginalGriff

Comments

Richard MacCutchan 29-Mar-14 6:12am

I do hope OP does not work for my bank.

OriginalGriff 29-Mar-14 6:24am

So do I!
(And not just because my login password would fail his tests!)