GridView Footer Spanning Columns

To add a footer to your Gridview you can use this code.  I’ve seen other samples that “deleted” the columns, but I couldn’t get those to work (they hung off the side still visible)!
protected void gvLOContactsNotAssigned_RowDataBound(object sender, GridViewRowEventArgs e)
       {
           if (e.Row.RowType == DataControlRowType.DataRow)
           {  
               AddValidations(sender, e);
           }
           else if (e.Row.RowType == DataControlRowType.Footer)
           {
               e.Row.Cells[0].Text = "* Contact Phone is required";
               //how many cells?
               int cols = e.Row.Cells.Count;
               for (int i = 0; i < cols; i++)
               {
                   //remove all but the first (0)
                   if (i != 0)
                   {
                       e.Row.Cells[i].Visible = false;
                   }
               }
               //span the length of the other cells
               e.Row.Cells[0].ColumnSpan = cols;
           }
       }