Hi,

i defined a dropdownlist in an EditTemplate of a detailsview like this:

<EditItemTemplate>
<asp:DropDownList ID="drop1" runat="server"></asp:DropDownList>
</EditItemTemplate>

I want to populate it in code-behind; i tried this:

Protected Sub DetailsView1_ItemCreated(ByVal sender As Object, ByVal e As
System.EventArgs) Handles DetailsView1.ItemCreated
       If DataControlRowState.Edit Then    'only in edit mode
           If DataControlRowType.DataRow Then    'only datarow
               Dim dd1 As DropDownList
               Dim z1 As ListItem
               Dim i As Integer
               dd1 = CType(DetailsView1.Rows(5).FindControl("drop1"),
DropDownList)
               For i = 0 To 20
               z1 = New ListItem(i, i)
               dd1.Items.Add(z1)
               Next
           End If
       End If
   End Sub

But i get the error:"Object reference not set to an instance of an object"
at line:  dd1.Items.Add(z1)

Thanks for help
Jan