e.Item.DataItem in a ItemDataBound event (DataGrid)

[MattB]

I swear I've made this work no problem before and I'm not sure what's
gone wrong.

I have a form with a datagrid that I'm binding to a DatTable I generate
on the fly. If I just bind and load the page I can see all my data fine.

Now I want to add a textbox for each row and pre-populate that box with
values from my DataTable. So I created a OnItemDataBound event and it's
firing. My problem is that any time I try to reference data in the
source table I get a runtime error NullReferenceException.

Below is my ItemDataBound event. Can anyone see what my mistake(s)
is/are? It pukes when it hits that Case statement that refers to
e.Item.DataItem. I don't get it. Thanks!

Sub dgGuest_ItemDataBound(ByVal source As Object, ByVal e As
DataGridItemEventArgs)
Dim editCell As TableCell = e.Item.Controls(1), tb As New TextBox

'only bother with non-header or footer items
If (e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem) Then
End If

Select Case e.Item.DataItem("ColName")
Case "birth_date"
tb.Text = CType(e.Item.DataItem("val"),
Date).ToShortDateString
editCell.Controls.Add(tb)
Case Else
tb.Text = Convert.ToString(e.Item.DataItem("val"))
editCell.Controls.Add(tb)
End Select

End Sub

 

[Guest]

Pls put that inside


If (e.Item.ItemType = ListItemType.Item Or _
e.Item.ItemType = ListItemType.AlternatingItem) Then
Dim editCell As TableCell = e.Item.Controls(1), tb As New TextBox

End If

 

[Matt Berther]

Hello MattB,

Clearly, the problem here is that there is nothing inside your If condition.
Put the End If after the End Select.

The reason for this is that the first item is ListItemType.Header and it
does not have an e.Item.DataItem.

 

[MattB]

Thanks to you both! Stupid mistake and I don't know why I didn't see that...

Matt

 

[Muru]

Error on ItemdataBound

Hi,
I am trying to edit a column in the datagrid. When I searched the net, ItemdataBound was the major solution suggested. I tried incorporating it but I keep getting an error. In the ItemDataBound function, it tries to compare E.Item.Controls(i).Controls(0).GetType().ToString() to a string called "System.Web.UI.WebControls.TextBox". But the thing is that when i=0, E.Item.Controls(i).Controls(0).GetType().ToString() comes up as "System.Web.UI.WebControls.Button", but when i>0, it retuns an error called "System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values. Parameter name: index". I have the complete function below. I would appreciate any help. Thank you very much.

Sub MyDataGrid_ItemDataBound(ByVal Sender As Object, ByVal E As DataGridItemEventArgs)
If (E.Item.ItemType = ListItemType.EditItem) Then
Dim i As Integer
For i = 0 To E.Item.Controls.Count - 1
If (E.Item.Controls(i).Controls(0).GetType().ToString() = "System.Web.UI.WebControls.TextBox") Then
Dim tb As TextBox
tb = E.Item.Controls(i).Controls(0)
tb.Text = Server.HtmlDecode(tb.Text)
End If
Next
End If
End Sub