xaml code:
 xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit"
     <xctk:CheckComboBox x:Name="Cb_Blowshell" HorizontalAlignment="Left" Margin="195,9,0,0" Grid.Row="2" VerticalAlignment="Top" Width="267"  DisplayMemberPath="prod_name"  ValueMemberPath="Id"  ItemsSource="{Binding}"/>
c# code
DataTable dt = new DataTable("blow_shell");
String Qry = "select Id,prod_name from blow_shell where weight=" + Txt.Text.Trim().ToString() + "";
SqlHelper.Fill_dt(dt, Qry);
Cb_Blowshell.ItemsSource= dt.DefaultView;
Its brief code to bind datatable data to combobox; but my resulted display member show System.Data.DataRowView. 
Please help me to solve.
 
     
    