Database Logon Failed in Drill Down reports

Question

I am developing reports on Crystal Reports XI R2, VS.NET 2005 , SQL Server 2000, C#.
I am getting Database Logon Failed when I click on a drill down link in the report. It works if I click on the drill down link with in a minute. But if I wait for a minute and click on drill down, I am getting Database Logon Failed 
Error in Crystal report viewer14
Object reference not set to an instance of an object
Any help would be greatly appreciated.
Thanks,
Sailu

Answer 1

The above code should be written after the loading of report.
For example-
private void Page_Load(object sender, System.EventArgs e)
               // Put user code to initialize the page here
               if (!IsPostBack)
                    crReport.Load(Server.MapPath("CrystalReport1.rpt"));
                    ConnectionInfo crConn= new ConnectionInfo();
                    crConn.ServerName="D-3271-SQL";
                    crConn.DatabaseName="Northwind";
                    crConn.UserID="sa";
                    crConn.Password="sa";
                    Tables crTables=crReport.Database.Tables;
                    foreach(CrystalDecisions.CrystalReports.Engine.Table crTable in crTables)
                         TableLogOnInfo crLogoninfo=crTable.LogOnInfo;
                         crLogoninfo.ConnectionInfo =crConn;
                         crTable.ApplyLogOnInfo(crLogoninfo);
               CrystalReportViewer1.ReportSource =crReport;
I hope this help
Regards
Amit
Edited by: Amit Singh on Aug 21, 2008 4:48 PM