Hello asit pani,
Thank you for using our services.
This error says that you have set both the DataSourceID and the DataSource properties of the grid control which you are using. You should set only one of those properties. Try setting only the the DataSource one. Most probably you are setting the DataSourceID property in the markup, where as the DataSource one is getting set in code. Remove the DataSourceID property setting from markup.
the Telerik team
Watch a video
on how to optimize your support resource searches and
check out more tips
on the blogs.
Follow the status of features or bugs in
and vote for them to affect their priority.