Generate a composite header in the GridView

1. Add a class file

                                                       SplitTableHeader(GridViewRow targetHeader, = targetHeader.Cells;          strCss =         row = col =[,] nameList = RowSpan =  ColSpan =  ( k = ; k < row; k++ LastFName =  ( i = ; i < col; i++ (LastFName == nameList[i, k] && k != row - == bFlag =  == TableHeaderCell());                         tcl[tcl.Count - ].RowSpan =- ].ColumnSpan =- ].HorizontalAlign =- ].Text = -[] EndColName = LastFName.Split( [] {  ( eName  TableHeaderCell());                             tcl[tcl.Count - ].HorizontalAlign =- ].Text =- ].CssClass = (k != row -                 tcl[tcl.Count - ].Text = tcl[tcl.Count - ].Text +                                           IsVisible([,] ColumnList,  rowIndex,  colIndex,  (rowIndex !=  (ColumnList[colIndex, rowIndex - ] ==  (ColumnList[colIndex, rowIndex].Contains( -                                                  GetSpanRowCount([,] ColumnList,  row,  rowIndex,  LastName =  RowSpan =  ( k = rowIndex; k < row; k++ (ColumnList[colIndex, k] ==++=                                                      GetSpanColCount([,] ColumnList,  row,  col,  rowIndex,  LastName = ColSpan = ColumnList[colIndex, row - ].Split( [] { = ColSpan ==  ?  ( i = colIndex + ; i < col; i++ (ColumnList[i, rowIndex] ==+= ColumnList[i, row - ].Split( [] { =                                         [,] ConvertList( newHeaders,  row, [] ColumnNames = newHeaders.Split( [] { [,] news =   Name =  ( i = ; i < col; i++[] CurrColNames = ColumnNames[i].ToString().Split( [] {   ( k = ; k < row; k++ (CurrColNames.Length -  >= (CurrColNames[k].Contains( (CurrColNames.Length != (Name == = news[i, k - =+ ] == == (Name == = news[i, k - ==                               GetRowCount([] ColumnNames = newHeaders.Split( [] {  Count =  ( name  TempCount = name.Split( [] {   (TempCount >=                              GetColCount( newHeaders.Split( [] { 

2. Add the following code in the OnRowCreated event.

   gvO_RowCreated( (e.Row.RowType ===  header = =

3 .: