Multi Header row for asp.net gridview?

itsmesri

I am trying to add sort for multi header row for asp.net gridview. I am adding second header row from code behind while gridview generating. Datatable functions are not applying for my grid and it is throwing exception also.

Gridview looks like
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http://i.stack.imgur.com/JF2l3.png

Html code
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[code]



BUFunctionSub - FunctionInitiative NameLocationCost CenterEstimated Cost Savings


   
   
LowHigh


UNKNOWNUNKNOWNUNKNOWNtest9ClevelandAcct-Cash Management2,0003,000
[/code]

Error
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http://i.imgur.com/sMAz67r.jpg


Please help me How can I do sorting this code?