Hi,

Can someone explain me why the same code with the event
GridView1_RowDataBound gives this error:

'DropDownList1' has a SelectedValue which is invalid because it does not exist in the list of items.
Parameter name: value

and not with the event GridView1_RowCreated ?

In normal mode, everything is shown correcly, but when i click on the Edit button in the gridview, the error happens.

Thanks
H.


Protected Sub GridView1_RowDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.GridViewRowEventArgs) Handles
GridView1.RowDataBound
        If (e.Row.RowState And DataControlRowState.Edit) =
DataControlRowState.Edit Then
            If e.Row.RowType = DataControlRowType.DataRow Then
                Dim dd As DropDownList
                Dim i As Integer
                Dim z As ListItem
                dd = e.Row.FindControl("DropDownList1")
                For i = 1 To 20
                    z = New ListItem(i, i)
                    dd.Items.Add(z)
                Next
            End If
        End If
End Sub

aspx file:
---------
 <asp:TemplateField>
 <EditItemTemplate>
 <asp:DropDownList ID="DropDownList1" runat="server" Width="90px" SelectedValue='<%# Bind("wa") %>' >
 </asp:DropDownList>
 </EditItemTemplate>
 <ItemTemplate>
 <asp:Label ID="Label2" runat="server" Text='<%# Bind("wa") %'> </asp:Label>
 </ItemTemplate>
 </asp:TemplateField>