Problem implementing a Bound ComboBox in DataGrid (5.8)

I downloaded the sample programs associated with FAQ 5.8 - Adding a ComboBox to the DataGrid I have the unbound version working in my app, but I need to get the bound version working in my app. It works in it's sample but in my app it gives the following message: ------------------ An unhandled exception of type 'System.InvalidCastException' occurred in system.windows.forms.dll Additional information: Cast from string "Note" to type 'Double' is not valid. ------------------ Does anyone have any ideas what I did wrong? I really need to get this workiing! Thanks, Rick

> I downloaded the sample programs associated with FAQ 5.8 - Adding a ComboBox to the DataGrid > > I have the unbound version working in my app, but I need to get the bound version working in my app. > It works in it's sample but in my app it gives the following message: > ------------------ > An unhandled exception of type 'System.InvalidCastException' occurred in system.windows.forms.dll > > Additional information: Cast from string "Note" to type 'Double' is not valid. > ------------------ > > Does anyone have any ideas what I did wrong? > I really need to get this workiing! > > Thanks, > Rick ------------- You may be having problems with a default value of DBnull. See this article http://support.microsoft.com/default.aspx?scid=kb;EN-US;318039