devexpress gridview grid not refresh

Public Sub grid_RowInserting(ByVal sender As Object, ByVal e As DevExpress.Web.Data.ASPxDataInsertingEventArgs) Handles grid.RowInserting
        Try


            With cos
                .CustomerName = e.NewValues(0)
                .CustomerCode = e.NewValues(1)
                .CustomerDesc = e.NewValues(2)
            End With

            ocou.Insert(cos)
            If grid.IsLoading Then
                Dim prevIndex As Integer = grid.EditingRowVisibleIndex
                grid.CancelEdit()
                If prevIndex < 0 Then
                    grid.StartEdit(0)
                Else
                    grid.StartEdit(prevIndex)
                End If
            End If



        Catch ex As Exception

        End Try
    End Sub