WPF中ComboBox绑定数据库自动读取产生数据

前台端      
 <ComboBox HorizontalAlignment="Left" Margin="410,113,0,0" VerticalAlignment="Top" Width="300"Name="cmb_SSBM" DisplayMemberPath="NAME" SelectedValuePath="CODE" SelectedIndex="-1" / > 

后台代码段            
WJKCDataContext wjkc = new WJKCDataContext();
            cmb_SSBM.ItemsSource = wjkc.BMDA.ToList();
            wjkc.Dispose();