Gridview Paging problem

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.NET

Hi ,
I am using gridview for displaying data according to search.
eg.:

gridsearch()
{
   //in this i wrote code for searching using userid or username or date
} 

i bind the data in button click. Then I wrote Pageindexchanging:

GridView1_pageindexchangind()
{
  GridView1.PageIndex=e.NewPageIndex;
  gridsearch();
  GridView1.DataBind();
}
// what my problem is, when i search with userid=4766 it displays the users with the userid in 4 pages of gridview.

But when I click 2nd page it binds complete database. Only first page displays my search details
but 2nd page onwards it binds all the data in the database.

Please give a solution on this.