Crystal report DataBase Connection Issue.

Question

I am trying to change the connection string of the report file dynamically base on the connection info in the web.config.
I have connected to the database A while designing  the report if  to change the database dynamically to database B from code behind.
I have used the following code.
But getting an error as "DataBase Logon failed".
may some one help  in resolving this issue ASAP.
ParameterFields myParams = new ParameterFields();
                        ParameterField myParam = new ParameterField();
                        ParameterDiscreteValue myDiscreteValue = new ParameterDiscreteValue();
                        myParam.ParameterFieldName = "@ID";
                        myParam.ReportName = strreportfile;
                        myDiscreteValue.Value = Convert.ToInt32(Session["ID"]);
                        myParam.CurrentValues.Add(myDiscreteValue);
                        myParams.Add(myParam);
                                           CrystalReportViewer1.EnableDatabaseLogonPrompt = false;
                        CrystalDecisions.Shared.TableLogOnInfo crConnectionInfo = new CrystalDecisions.Shared.TableLogOnInfo();
                        crConnectionInfo.ConnectionInfo.ServerName = ConfigurationManager.AppSettings["ServerName"].ToString();                        crConnectionInfo.ConnectionInfo.DatabaseName = ConfigurationManager.AppSettins["DatabaseName"].ToString();
                        crConnectionInfo.ConnectionInfo.UserID = ConfigurationManager.AppSettings["UserId"].ToString();
ConfigurationManager.AppSettings("UserID").ToString;
                        crConnectionInfo.ConnectionInfo.Password = ConfigurationManager.AppSettings["password"].ToString();
                        foreach (InternalConnectionInfo conn in objReportDocument.DataSourceConnections)
                            conn.SetConnection(crConnectionInfo.ConnectionInfo.UserID, crConnectionInfo.ConnectionInfo.Password, crConnectionInfo.ConnectionInfo.ServerName, crConnectionInfo.ConnectionInfo.DatabaseName);
                        CrystalReportViewer1.EnableParameterPrompt = false;
                      objReportDocument.OpenSubreport("test2.rpt");
                     objReportDocument.Subreports[0].SetDatabaseLogon(crConnectionInfo.ConnectionInfo.UserID, crConnectionInfo.ConnectionInfo.Password, crConnectionInfo.ConnectionInfo.ServerName, crConnectionInfo.ConnectionInfo.DatabaseName);
                        for (int index = 0; index <= reportdoc.Database.Tables.Count - 1; index++)
                          reportdoc.Database.Tables[index].ApplyLogOnInfo(crConnectionInfo);
                   CrystalReportViewer1.ParameterFieldInfo = myParams;
                        CrystalReportViewer1.ReportSource = objReportDocument;

Answer 1

Moved to .NET SDK forums.
SEARCH here, 100's of posts on how to debug your DB connection problem.
Good luck
Don