Question

i have a GridView with LinqDataSource. im using the following technique to populate a field (Supplier in this case) with dropdownlist, containing values from a different LinqDataSource:

_{(source: scottgu.com)}

however, lets say my Supplier field is allowed to be null. any ideas how to allow entering null value, alongside with the other SupplierDataSource options?

Answer 1

Please try this:

    <asp:DropDownList ID='DropDownList1'       DataSourceID='SupplierDataSource'       DataValueField='SupplierID'       DataTextField='CompanyName'       SelectedValue='<%#Bind('SupplierID')%>'       runat='server'       AppendDataBoundItems='true'>         <asp:ListItem Value='' Text='None' />     </asp:DropDownList> 

This should add an empty list item to your dropdown. I believe your datasource will interpret this as a null value, but I have not tested the code yet.

Hope this helps!