Error in record filter using RecordSelectionFormula

Question

I am trying to filter record using ASP.NET MVC 5 with ReportDocument RecordSelectionFormula, but I am getting error:

CrystalDecisions.CrystalReports.Engine.LogOnException: 'Database logon failed.'

inner Exception COMException: Database logon failed.

My code is given bellow here

string Examtype = Request.Form["Examtype"];
string ExamYear = "1444";
string DarjaID = Request.Form["DarjaID"];
string Regid = Convert.ToString(Session["Regid"]);

ReportDocument rd = new ReportDocument();

string relativePath = Server.MapPath("~") + "Reports/Rolnoslips/RolnoslipBnat.rpt";
rd.Load(relativePath);

rd.RecordSelectionFormula = $@"{{StudentIncentreWRoll.Courseid}} = ""{DarjaID}"" and
                                            {{StudentIncentreWRoll.Regid}} = ""{Regid}"" and 
                                            {{StudentIncentreWRoll.Status}} <> ""0"" ";
rd.SetDatabaseLogon(db._UserName, db._Password, db._ServerName, db._DataBase);
                //rd.Refresh();

Response.Buffer = false;
Response.ClearContent();
Response.ClearHeaders();

Stream stream = rd.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);
stream.Seek(0, SeekOrigin.Begin);

Response.AppendHeader("Content-Disposition", $"inline; filename=Rolnoslips-{DateTime.Now}.pdf");

return File(stream, "application/pdf");

When I click on "save data in report" in Main Report Preview, the report is loaded successfully but show only save data, not show the required filter record.

How use RecordSelectionFormula & refresh the report?

Also when I try to uncomment rd.Refresh(), facing given below error

inner Exception COMException: Database logon failed.