Inserting a combobox in a datagrid in wpf

C#

 MainDataContext db = new MainDataContext();
var cat = from p in db.Categories
                      select p;
categoriesComboBox.ItemsSource = cat;
            categoriesComboBox.SelectedValuePath = "ID";
            categoriesComboBox.DisplayMemberPath = "CatName";

XAML

<Custom:DataGridComboBoxColumn                                    
Width="1*"                                  x:Name="categoriesComboBox" 
Header="Category"
ItemsSource="{Binding}"
SelectedValueBinding="{Binding Path=Category}"
SelectedValuePath="ID"
DisplayMemberPath="CatName"
/>

Now the thing is i can see the name in the comobox when it loads... when i click on the combobox the dropdown shows me MainDataContext.Category for each and开发者_Go百科 every item...

when i click on any of the drop down items.. its select the correct value and.. showing me in the combobox...

You should not set categoriesComboBox.ItemsSource = cat; yourself, try doing it with the data context: categoriesComboBox.DataContext = cat. Anyway, you've got the needed bindings in your XAML.

Hope that this is your actual problem (since I didn't manage to understand what the problem is from your question).

Edit: from your images, you need to specify a DataTemplate for your type MainContext.Category. Without it, the default template is used, which just outputs the string representation.