Question

I would like to have a radiobuttollist were you can select value null.

Something like this:

<asp:RadioButtonList ID="rblCD" runat="server" SelectedValue='<%# Bind("tblCD") %>'>
           <asp:ListItem Value="RW">RW</asp:ListItem>
           <asp:ListItem Value="R">R</asp:ListItem>
           <asp:ListItem Value="DBNull">None</asp:ListItem>
 </asp:RadioButtonList>

Thanks a lot,
Vincent

Answer 1

THe values in a radiobuttonlist are always strings. You would have to do something like this

<asp:ListItem Value="">None</asp:ListItem>

Then when you read the data from the control do something like

if (rblCD.SelectedValue == string.Empty)
{
    MyDataRow["Column"] = DBNull.Value;
}