Hi All
 I have a shoppingcart.aspx web form that use coding same as source in IBUYSPY( sample from www.asp.net) and use Oracle92 for its database.For the selection productID to Cart,it works fine but if i click the update button.It shows error like this.

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Index was out of range. Must be non-negative and less than the size of the collection. Parameter name: index

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And It highlights on this line.

If quantity <> CInt(DataGrid1.DataKeys(i)) Or remove.Checked = True Then

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And this is my code.

Sub UpdateShoppingCartDatabase()

        Dim cart As VCDeasy.ShoppingCartDB = New VCDeasy.ShoppingCartDB
        ' Obtain current user's shopping cart ID
        Dim cartId As String = cart.GetShoppingCartId()

        ' Iterate through all rows within shopping cart list
        Dim i As Integer
        For i = 0 To DataGrid1.Items.Count - 1

            ' Obtain references to row's controls

            Dim quantityTxt As TextBox = CType(DataGrid1.Items(i).FindControl("Quantity"), TextBox)
            Dim remove As CheckBox = CType(DataGrid1.Items(i).FindControl("CheckBox1"), CheckBox)

            ' Wrap in try/catch block to catch errors in the event that someone types in
            ' an invalid value for quantity
            Dim quantity As Integer

            quantity = CInt(quantityTxt.Text)

            ' If the quantity field is changed or delete is checked
            If quantity <> CInt(DataGrid1.DataKeys(i)) Or remove.Checked = True Then

                Dim lblProductID As Label = CType(DataGrid1.Items(i).FindControl("ProductID"), Label)

                If quantity = 0 Or remove.Checked = True Then
                    cart.RemoveItem(cartId, CInt(lblProductID.Text))
                Else
                    cart.UpdateItem(cartId, CInt(lblProductID.Text), quantity)
                End If
            End If


        Next
    End Sub

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I think the problem come from i - parameter but not understand for this point.
How i can solve this problem?

Thanks in advance

Blueman137