Previouspage=null when using gridview

Hi Friends...

I am using two pages: Page1.aspx and Page2.aspx ...... im redirecting from Page1.aspx to Page2.aspx using Response.Redirect("Page2.aspx");

In Page1 i am using Gridview, grdview has LinkButton with CommandName = "Update".

Added Event GridView_RowUpdating, in this event i am storing Datakeynames value in Hidden variable and then redirecting to Page2.

Now PreviousPage is null when i click on LinkButton in Gridview. if i add another linkbutton outside gridview then it works fine.

Pls help me.

Thanks & Regards.
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