page navigation is out of range in reportviewer

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ASP.NET

SSRS

reporting

heyy...

I am using the SSRS report ..when I click navigation button after showing the report ( it is in one page) the next page navigation button is shown ..when i click it ..It shows following error
("page navigation is out of range")

How to solve this ...

I search a lot ...many of saying give

if (IsPostBack)
                return;

But it won't work....

My Code is below..

<rsweb:ReportViewer ID="rvPriceListDetails" BackColor="White"  runat="server" ProcessingMode="Remote"   Width="100%"  ZoomPercent="100" AsyncRendering="true">
         </rsweb:ReportViewer>

Code
-----

private void InitializeReportCredentials()
       {
           string server = ConfigurationManager.AppSettings["ReportServer"];
           string reportpath = ConfigurationManager.AppSettings["ReportsFolder"];
           string username = ConfigurationManager.AppSettings["Username"];
           string password = ConfigurationManager.AppSettings["Password"];
           string Domain = ConfigurationManager.AppSettings["Domain"];
           rvPriceListDetails.ProcessingMode = Microsoft.Reporting.WebForms.ProcessingMode.Remote;
           if (IsPostBack)
               return;

           rvPriceListDetails.ServerReport.ReportServerUrl = new System.Uri(server);
           rvPriceListDetails.ServerReport.ReportPath = string.Concat(reportpath, ReportName);
           rvPriceListDetails.ShowParameterPrompts = true;
           rvPriceListDetails.ServerReport.ReportServerCredentials = new ReportCredentials(username, password, Domain);
           rvPriceListDetails.ServerReport.Refresh();
           ReportParameter UserName = new ReportParameter("UserName", SessionManager.Current.UserObject.UserName);
           rvPriceListDetails.ServerReport.SetParameters(new ReportParameter[] { UserName });
       }