DataTable TmpTable = ThisDataset.Tables[tabControl.SelectedIndex];
                List<DataColumn> dcListToRemove = new List<DataColumn>();
                foreach (DataColumn dc in TmpTable.Columns)
                {
                    if (!ColumnNeed(dc))
                    {
                        dcListToRemove.Add(dc);
                    }
                }
                foreach (DataColumn dc in dcListToRemove)
                {
                    dc.Table.Columns.Remove(dc);                    
                }
                dcListToRemove.Clear();
                DataGrid dGrid = ((TabItem)tabControl.SelectedItem).Content as DataGrid;
                if (dGrid != null)
                {
                    dGrid.DataContext = TmpTable.DefaultView;
                    dGrid.ItemsSource = TmpTable.DefaultView;
                    
                }