Crystal Report problem

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ASP.NET

I have designed crystal report e.g. myreport.rpt.
and i am passing parameter at runtime from aspx page to this report but it is showing message;


"The report you requested requires further information."


Server name:
Database name:
User name:
Password:
Use Integrated Security



but I have added this information when reportDocument is generated.

i.e.
ReportDocument objRpt = new ReportDocument();

objRpt.FileName = Server.MapPath("~/Report/myreport.rpt");
objRpt.SetDatabaseLogon("root", "", "localhost", "test");
objRpt.SetDataSource(Ds);
objRpt.Load(objRpt.FileName);