Hi Ashwini,
As per my understanding, I assume that you want to show empty gridview when there is no data to be binded, but can add data on the run. If so, then please use this.
<asp:GridView>
<EmptyDataTemplate>ITemplate</EmptyDataTemplate>
</asp:GridView>
Please go through the below MSDN link for more details
http://msdn.microsoft.com/en-us/library/system.web.ui.webcontrols.gridview.emptydatatemplate.aspx[
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Let me know if this has helped you or not.!
Thank you,
Vamsi.