Datagridview cellvalidating is not working perfectly

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I have 3 columns

* Item Name
* Quantity on Hand
* Quantity to transfer

the item name and the qty on hand is diplayed to the user . If he tries to input a number which is more than the Qty he has on Hand; i need a messageBox to pop up...

However the event is not firing the exact time I want. It allows me to leave the row without the message popping up.

What I have tried:

Private Sub DataGridView1_CellValidating(ByVal sender As Object, ByVal e As System.Windows.Forms.DataGridViewCellValidatingEventArgs) Handles DataGridView1.CellValidating

With DataGridView1.Rows(e.RowIndex)
If e.ColumnIndex = 2 Then '' this is the col index for qty to be transfered
If .Cells(2).Value > .Cells(1).Value Then
MessageBox.Show("You don't Have sufficient quantity ", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
e.Cancel = True
End If
End If
End With
end sub

Posted 11-Aug-16 10:51am

Sharma Hussein

Updated 13-Aug-16 21:16pm

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ProgrammingEnthusiast · Accepted Answer · 2016-08-11T20:59:00

VB

Private Sub DataGridView1_RowValidating(sender As Object, e As DataGridViewCellCancelEventArgs) Handles DataGridView1.RowValidating
       Dim transferredQTY, onHandQTY As Double
       With DataGridView1.Rows(e.RowIndex)

           Try
               transferredQTY = Convert.ToDouble(.Cells(2).Value)
           Catch ex As Exception
               transferredQTY = 0
           End Try
           Try
               onHandQTY = Convert.ToDouble(.Cells(1).Value)
           Catch ex As Exception
               transferredQTY = 0
           End Try
           If transferredQTY > onHandQTY Then
               MessageBox.Show("You don't Have sufficient quantity ", "Input Error", MessageBoxButtons.OK, MessageBoxIcon.Error)
               e.Cancel = True
           End If

       End With
   End Sub

Sharma Hussein · Accepted Answer · 2016-08-13T21:16:00

Solution 2

Thanks J.O.V.Y... I think i found out what was the problem. The value wasn't written to the cell yet, so i used the value that is being passed from the event and that solved my problem

If Convert.ToInt32(e.FormattedValue) > Convert.ToInt32(.Cells(1).Value) Then

Posted 13-Aug-16 21:16pm