Calcular datos dentro de celdas

 Private Sub DataTable1DataGridView_CellEndEdit(sender As System.Object, e As System.Windows.Forms.DataGridViewCellEventArgs) Handles DataTable1DataGridView.CellEndEdit
        If e.ColumnIndex = 3 Then
            DataTable1DataGridView.CurrentRow.Cells(4).Value = DataTable1DataGridView.CurrentRow.Cells(2).Value * DataTable1DataGridView.CurrentRow.Cells(3).Value
        End If
    End Sub