Excel Export for Multi-Header UltraGrid

This is in continuation of the Blog on Multi-Header implementation of UltraWebGrid.

If the UltraWebGrid has multi-header then UltraWebGridExcelExporter doesnot export the Grid properly. The only way to get around the problem is to create a custom method to write the Grid data in xls format.
One way of doing this is by using StringBuilder to create html table and then passing it as a response. The Column and Rowspacing can be achieved using RowSpan and ColumnSpan of Table Header