>This is the error message and my code. Can somebody give me a hint about why I am getting this error message? Thank you in advance.
>
>ERROR MSG:***************************************
>Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index Exception Details: System.ArgumentOutOfRangeException: Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index
>
>CODE:***************************************

<snip>

>
> myCommand.Parameters("@cid").Value = Me.grdProducts.DataKeys(CInt(e.Item.ItemIndex))

The DataKeys collection and e.Item.ItemIndex are not always gauranteed to be synchronized. You should add a column to the grid that contains the primary key.

<snip>

> Dim NumCols As Integer = e.Item.Cells.Count
> Dim i As Integer
> For i = 4 To NumCols 'Skip first through fourth and last columns

When NumCols = e.Item.Cells.Count, e.Item.Cells will be out of range.

> Dim CurrentTextBox As System.Web.UI.WebControls.TextBox
> CurrentTextBox = e.Item.Cells(i).Controls(0)
> Dim ColValue As String = CurrentTextBox.Text
> If i < 6 And ColValue = "" Then
> Me.lblError.Text = "ERROR!!!!!"
> End If
> myCommand.Parameters(Cols(i - 1)).Value = ColValue

What is Cols in the previous line?

> Next
<snip>


There should be a source code line # in the error message that will tell you exactly where the error occurred. Which line is it occurring on?