Hello Moulika,

Thank you for posting in our community.

Here is a link from our documentation that explains step by step how to add a template column in the UltraWebGrid:

http://help.infragistics.com/Doc/ASPNET/2011.1/CLR4.0/?page=WebGrid_Using_Column_Templates.html

Then if you want to make all rows selected using header checkbox template, you may handle the click event of the checkbox control and use the client-side API of UltraWebGrid to make all rows selected as shown here:http://help.infragistics.com/Help/Doc/ASPNET/2011.1/CLR4.0/html/WebGrid_Select_a_Row_on_the_Client_Side.html

Please note also that "SelectTypeRowDefault" property should be set to "Extended" in order multiple row selection.

I'm attaching you a sample with similar scenario for your reference.

Please let me know if you have any further questions.

Sincerely,

Tsanna