Question

I have a datagrid where I am programatically adding a linkbutton on ItemDataBound.

Protected Sub dgCounts_ItemDataBound(ByVal sender As Object, ByVal e As System.Web.UI.WebControls.DataGridItemEventArgs) Handles dgCounts.ItemDataBound

            For i As Integer = 1 To (e.Item.Cells.Count - 1)

                Dim lb As New LinkButton
                lb.CommandArgument = aryDealers(i)
                lb.Text = e.Item.Cells(i).Text
                lb.CausesValidation = False
                AddHandler lb.Click, AddressOf lb_Click

                If e.Item.Cells(i).Text.Trim.Length > 0 Then
                    e.Item.Cells(i).Controls.Add(lb)
                End If

            Next
End Sub

Protected Sub lb_Click(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim lb As LinkButton = CType(sender, LinkButton)
        Dim s As String = lb.CommandArgument
End Sub

The linkbutton is adding to the grid cells correctly, but when you the click event is not firing.

Thoughts?
Thanks!

Answer 1

You should not add controls dynamically in the DataGrid’s ItemDataBound Event (or GridView’s RowDataBound-Event). ItemDataBound is only triggered when you databind the DataGrid to it’s DataSource. If you’ve enabled ViewState and databind it only if Not Page.IsPostback, the control would not be recreated on postbacks. Therefore no events are triggered.

You should use ItemCreated instead(RowCreated in GridView) to create controls dynamically, because ItemCreated is called on every postback.