Paging in devexpress report control

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ASP.NET

DevExpress

This code not working properly
First time it get correct data but when we change form value and click on summit buttom.
After click on paging icon in ReportToolbar then it shows previous session value in page.

protected void ReportViewer1_CacheReportDocument(object sender, DevExpress.XtraReports.Web.CacheReportDocumentEventArgs e)
   {
       e.Key = Guid.NewGuid().ToString();
       Page.Session[e.Key] = e.SaveDocumentToMemoryStream();
       }

   protected void ReportViewer1_RestoreReportDocumentFromCache(object sender, DevExpress.XtraReports.Web.RestoreReportDocumentFromCacheEventArgs e)
   {
       Stream stream = Page.Session[e.Key] as Stream;
       if (stream != null)
           e.RestoreDocumentFromStream(stream);
         }

   protected void ReportViewer1_Unload(object sender, EventArgs e)
   {
       ((ReportViewer)sender).Report = null;
   }