Paging

Hi, paging is not working for the SPGridView. i made pageSize=10, intially it is displaying 10,and when i click on next button, it is displaying only one item. Please let me know if you come across these issue

Made Allowpaging=true, OnPageIndexChanging="gridview_PageIndexChanging

In the code behind, 

  protected void ReqsGrid_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
          gridview.PageIndex = e.NewPageIndex;
           gridview.DataBind();
        }