Has anyone had any luck with this problem yet?  Thanks!

Dave

> Hi,

> I am building a DataGrid with dynamic columns added to the grid in 
P> age_Init.  As part of this, the EditItemTemplate is loaded into the 
D> ataGrid from a separate .ascx file via the Page.LoadTemplate method.

> My problem is that I am having difficulties finding the server controls 
w> ithin this dynamically-added EditItemTemplate, (which I need to do to 
c> hange their properties and add events dynamically).

> On a non-dynamic TemplateColumn, I would simply use the following code 
to 
f> ind a server control in an EditItemTemplate:

>     sub dg_ItemDataBound(sender as object, e as DataGridItemEventArgs)
 >    If (e.Item.ItemType = ListItemType.EditItem) then
 >    Dim lbtExampleLinkButton as LinkButton = e.Item.FindControl
(> "lbtExampleLinkButton")
 >    lbtExampleLinkButton.Text="Text property dynamically changed in 
d> g_ItemDataBound"
 >    end if
 >    end sub

> But when I try to do this for my dynamic TemplateColumn, it doesn't work 
(> neither in dg_ItemDataBound, nor in dg_ItemCreated), and I get the 
f> ollowing error message:

> 	System.NullReferenceException: Object reference not set to an 
i> nstance of an object

> Can anyone tell me how to locate these server controls in a dynamic 
T> emplate Column?

> Thanks,

> JON

> 

> ++++++++++++++++++++++++++++++++++++++++++++++++++++++
M> AIN DATAGRID PAGE 
(> the EditItemTemplate is in a separate ascx file, see below):
+> +++++++++++++++++++++++++++++++++++++++++++++++++++++

> 

> <%@ Page Language="VB" Debug="true" %>
<> %@ Import Namespace="System.Data" %>
<> %@ Import Namespace="System.Data.Oledb" %>

> 
<> script language="VB" runat="server">

> Dim objConn as New OleDbConnection ( ConfigurationSettings.AppSettings
(> "ConnectionString") )
D> im ds as Dataset = New DataSet()
D> im objAdapter as New OleDbDataAdapter ( "SELECT * FROM tblItems WHERE 
I> temID = 1;", objConn )

> 
S> ub Page_Init(sender as object, e as eventargs)
	> Dim tc1 As New TemplateColumn()
	> tc1.HeaderTemplate = New DataGridTemplate
(> ListItemType.Header, "Column1")
	> tc1.ItemTemplate = New DataGridTemplate
(> ListItemType.Item, "Column1")
	> tc1.EditItemTemplate = Page.LoadTemplate
(> "Example_EditItemTemplate.ascx")
	> tc1.FooterTemplate = New DataGridTemplate
(> ListItemType.Footer, "Column1")
	> dg.Columns.Add(tc1)
E> nd sub

> 
S> ub Page_Load(sender as object, e as eventargs)
	> objConn.Open()
	> objAdapter.Fill(ds, "tblItems")
	> dg.DataSource = ds
	> dg.DataMember = "tblItems"	
	> 
	> If Not Page.IsPostBack Then
	> dg.Databind()
	> End If
E> nd Sub

> sub dg_edit(sender as object, e as DataGridCommandEventArgs)
	> dg.edititemindex = e.item.itemindex
	> dg.databind()
e> nd sub

> sub dg_cancel(sender as object, e as DataGridCommandEventArgs)
	> dg.edititemindex = -1
	> dg.databind()
e> nd sub

> sub dg_update(sender as object, e as DataGridCommandEventArgs)	
	> 'Put an update function here
e> nd sub

> sub dg_command(sender as object, e as DataGridCommandEventArgs)
	> 'Do something later here
e> nd sub

> sub dg_ItemCreated(sender as object, e as DataGridItemEventArgs)
	> 'can't find lbtExampleLinkButton in dg_ItemDataBound or here 
either
e> nd sub

> sub dg_ItemDataBound(sender as object, e as DataGridItemEventArgs)
	> If (e.Item.ItemType = ListItemType.EditItem) then
	> 	Dim lbtExampleLinkButton as LinkButton = e.Item.FindControl
(> "lbtExampleLinkButton")
	> 	lbtExampleLinkButton.Text="Text property dynamically 
c> hanged in dg_ItemDataBound"
	> 	'*******************************************************
	> 	'Above line gets following error:
	> 	'System.NullReferenceException: Object reference not set 
t> o an instance of an object
	> 	'*******************************************************
	> 	AddHandler lbtExampleLinkButton.Click, AddressOf 
D> oSomething
	> end if
e> nd sub

> sub DoSomething(sender as object, e as EventArgs)
	> Response.Write("written in Sub DoSomething")
e> nd sub

> Private Class DataGridTemplate
	> Implements ITemplate
	> Dim templateType As ListItemType
	> Dim columnName As String
	> Sub New(ByVal type As ListItemType, ByVal ColName As String)
	> 	templateType = type
	> 	columnName = ColName
	> 	End Sub
	> 	Sub InstantiateIn(ByVal container As Control) Implements 
I> Template.InstantiateIn
	> 	Dim lc As New Literal()
	> 	Select Case templateType
	> 	Case ListItemType.Header
	> 	lc.Text = "<I><b>Header</b></I>"
	> 	container.Controls.Add(lc)
	> 	Case ListItemType.Item
	> 	lc.Text = "Item " & columnName
	> 	container.Controls.Add(lc)
	> 	Case ListItemType.EditItem
	> 	Dim tb As New TextBox()
	> 	tb.Text = ""
	> 	container.Controls.Add(tb)
	> 	Case ListItemType.Footer
	> 	lc.Text = "<I><b>Footer</b></I>"
	> 	container.Controls.Add(lc)
	> 	End Select
	> End Sub
E> nd Class

> 

> </script> 

> <html><body>

> <form runat="server" name="form1" id="form1">

> <asp:DataGrid id="dg" runat="server"
H> eaderStyle-BackColor="#cccc99"
F> ooterStyle-BackColor="#cccc99"
I> temStyle-BackColor="#ffffff"
A> lternatingItemStyle-Backcolor="#cccccc"
A> utoGenerateColumns="False"
S> howFooter="True"
O> nEditCommand="dg_edit"
O> nCancelCommand="dg_cancel"
O> nUpdateCommand="dg_update"
O> nItemCommand="dg_command"
O> nItemCreated="dg_ItemCreated"
O> nItemDataBound="dg_ItemDataBound"
>> 

> <Columns>	
<> asp:editcommandcolumn HeaderText="EDIT" edittext="Edit" 
C> ancelText="Cancel" UpdateText="Save" />
<> /Columns>

> </asp:dataGrid>

> </form> 
<> /body></html>

> __________________________________________________________________

> 
C> ODE FOR "Example_EditItemTemplate.ascx":

> 
<> %@ Control Language="VB" %>
<> p>
I> temTitle: <asp:Textbox id="tbItemTitle" runat="server" />
<> /p>
<> p>
I> temRating: <asp:TextBox id="tbItemRating" runat="server" />
<> /p>
<> p>
<> asp:LinkButton id="lbtExampleLinkButton" runat="server" 
T> ext="ExampleLinkButton" />
<> /p>
<> p>
<> asp:Button id="btExampleButton" runat="server" Text="ExampleButton" />
<> /p>