Hi Supriya
I assume you encounter this problem when you created a new project.
Refer to the Using GridGroupingControl section beneath the Introducing Essential Grouping Grid for ASP.NET in the Essential Grid for ASP.NET User Guide which is also available online at http://www.syncfusion.com/library which describes what you need to do after dragging and dropping a Grid control on to a Web Form.
The reason the samples work but not a new application is because the VS.NET Designer does not add
these lines for the other assemblies that are referenced.
You can copy and paste this from one of the existing samples. We are working on adding support for the designer to automatically add this to the .aspx file when you drag and drop a Grid control on to a WebForm.
Sorry for the inconvenience caused and do not hesitate to contact us if you have any further questions.
Regards
Arun
PS: The Essential Grid for ASP.NET forum is available
here.