Remove cell's in gridview edit mode

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This code is used for removing all cells except first cell(cell[0]).
In   cell[0] we will display edit itemTemplate.

                    GridView editGrid = sender as GridView;
                    int colSpan = editGrid.Columns.Count;
                    for (int i = 1; i < colSpan; i++)
                    {
                        e.Row.Cells[i].Visible = false;
                        e.Row.Cells[i].Controls.Clear();
                    }
                    e.Row.Cells[0].Attributes["ColSpan"] = (colSpan).ToString();

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