Problem showing selected value of combobox when it is bind to a List<T> using Linq to Entities

Question

I have a combobox which is has itemtemplate applied on it and is bind to a List of entity return using linq. i m using mvvm. It is bind to it successfully but when i set the selected value of it from code at runtime to show the selected value coming from db it doesn't select it. For reference here is my combobox xaml.

SelectedValue="{Binding Path=SelectedManufacturer}"
Grid.Column="3" Grid.Row="2" Margin="20,9.25,68,7.75"
ItemTemplate="{StaticResource ManufacturerDataTemplate}" TabIndex="6"/>

Here is my part from code behind from viewModel.

List currentManufacturers = new List();

tblManufacturer selectedManufacturer = null;

public List CurrentManufacturers { get { return currentManufacturers; } set { currentManufacturers = value; NotifyPropertyChanged("CurrentManufacturers"); } }

    public tblManufacturer SelectedManufacturer
    {
        get
        {
            return selectedManufacturer;
        }
        set
        {
            selectedManufacturer = currentManufacturers.Where(mm => mm.ManufacturerID == Convert.ToInt32(selectedDevice.tblManufacturer.EntityKey.EntityKeyValues[0].Value)).First();
            NotifyPropertyChanged("SelectedManufacturer");
        }
    }

Answer 1

Here is the sample code snippet:

Xaml for ComboBox:

 <ComboBox ItemsSource="{Binding ManufacturerList}" DisplayMemberPath="Name" SelectedValuePath="ID"
              SelectedItem="{Binding SelectedManufacturer}"/>

ViewModel code :

 public class Manufacturer
{
    public int ID { get; set; }

    public string Name { get; set; }
}





 private List<Manufacturer> _manufactuerlist;
   private Manufacturer _selectedManufacturer;

 private void NotifyPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }

#region INotifyPropertyChanged Members

        public event PropertyChangedEventHandler PropertyChanged;

        #endregion
    public Manufacturer  SelectedManufacturer
    {
        get
        {
          return _selectedManufacturer;
        }
        set
        {
            _selectedManufacturer = value;
            NotifyPropertyChanged("SelectedManufacturer");
        }
    }

    public List<Manufacturer> ManufacturerList
    {
        get
        {
            return _manufactuerlist;
        }
        set
        {
            _manufactuerlist = value;
            NotifyPropertyChanged("ManufacturerList");
        }
    }

And finally Set the Selected Manufacturer in your view model like this:

SelectedManufacturer = _manufactuerlist.Find(m => m.ID == 2);