datagrid error on change page (VB.ASP.NET)

[Mad Scientist Jr]

I am getting an error in my code that references a textbox inside the
current row of my datagrid, whenever I try changing the page (paging is
enabled). This code doesn't even run unless a button in the datagrid is
clicked, but is erroring out the page when I click page 2,3,etc.

I have tried a few different notations without any luck. Can someone
look at the lines below and tell me what might be wrong? Thanks in
advance!

'event being used to change page:
Private Sub DataGrid1_PageI ndexChanged(ByV al source As Object, ByVal e
As System.Web.UI.W ebControls.Data GridPageChanged EventArgs) Handles
DataGrid1.PageI ndexChanged
DataGrid1.Curre ntPageIndex = e.NewPageIndex
Call BindGrid() ' bind data to the datagrid
End Sub

'code that the error is occurring in when page changed
'contains code for buttons inside template columns in datagrid
'in the .aspx file the datagrid's OnItemCommand property
'is set to reference this sub:
' OnItemCommand=" ExecuteDataGrid Commands"
Public Sub ExecuteDataGrid Commands(ByVal sender As Object, ByVal e As
DataGridCommand EventArgs)

'reference textbox "txtID" inside current row of datagrid
Dim txtID As TextBox

'the following line is where the error occurs:
txtID = DataGrid1.Items (e.Item.ItemInd ex).FindControl ("txtID")

' i tried this instead, a paging error doesnt occur,
' but this line causes a different error (control not found):
' txtID = DataGrid1.FindC ontrol("txtID")

'someone suggested this method, but it didn't work
'Dim iIndex As Int32
'iIndex = e.Item.ItemInde x - (DataGrid1.Curr entPageIndex *
DataGrid1.PageS ize)
'txtID = DataGrid1.Items (iIndex).FindCo ntrol("txtID")

etc.

[Mad Scientist Jr]

I figured it out...

Evidently the datagrid template columns code is evaluated when a change
page event happens, and at the moment it is evaluated, the current
datagrid item is -1. Simply putting in a check for -1 solved the
probrem:

Public Sub ExecuteDataGrid Commands(ByVal sender As Object, ByVal e
As DataGridCommand EventArgs)
If e.Item.ItemInde x > -1 Then
Dim txtID As TextBox
txtID =
DataGrid1.Items (e.Item.ItemInd ex).FindControl ("txtID")

Mad Scientist Jr wrote:

I am getting an error in my code that references a textbox inside the
current row of my datagrid, whenever I try changing the page (paging is enabled). This code doesn't even run unless a button in the datagrid is clicked, but is erroring out the page when I click page 2,3,etc.