Combobox binding with DisplayMemberPath and selectedMemberPath

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C#

WPF

C#4.0

Binding database id,name to combobox using DisplayMemberPath and selectedMemberPath but i couldnt get how to access the id value. below is the code am using.what is wrong that am doing and to rectify it get id value upon selectionchanged.

person class

public class Person
{
public int Uid{get; set;}
public string UName{get; set;}
public Person(int id,string name)
{
Uid=id;
UName=name;
}
}

internal IEnumerable<Person> GetDataForComboBox(string spName)
        {
            return CommonToAll(spName).AsEnumerable().Select(row =>
            {
                return new Person
                {
                   Uid = Convert.ToInt32(row["UserID"]),
                    UName= Convert.ToString(row["UserName"]),
                };
            });

        }

var transData = objDC.GetDataForComboBox("spGetAllData");
 observallableCollection<Person> data=new  observallableCollection<Person>();
  cmbTransporter.Items.Add(new Person(0,"-Select Any- "));
                    foreach (var item in transData)
                    {
                        cmbTransporter.Items.Add(new Person(item.Uid,item.UName));
                    }
               cmbTransporter.ItemsSource=data;
               cmbTTCTransporter.SelectedIndex = 0;

In Xaml

<Combobox Name="cmbTransporter" selectedValuePath="{ Binding Person}" DisplayMemberPath="UName" SelectedValue="Uid"/>

In the above case,able to bind but nt bale to access id ??? how can get id by using above code.
Every time i cannot use combobox selected index because suppose if i delete any item in combobox all my code will not run as i required.Instead of saving selected index want to use selected value that means id which i want to bind whie saving to datatbase.

where i went wrong let me know plsss.