ConnectionInfo ci = new CrystalDecisions.Shared.ConnectionInfo();
        TableLogOnInfo Log = new CrystalDecisions.Shared.TableLogOnInfo();
        CrystalReportSource1.Report.FileName = ReportName;
        Sections mySections;
        SubreportObject mySubreportObject;
        ReportObjects myReportObjects;
        
        CrystalReportSource1.Report.FileName = ReportName;
        ci.ServerName = " ServerName ";
        ci.DatabaseName = " DatabaseName ";
        ci.IntegratedSecurity = true;

        Database myDatabase = CrystalReportSource1.ReportDocument.Database;
        Tables myTables;
        myTables = myDatabase.Tables;

        foreach (Table myTable in myTables)
        {
            Log = myTable.LogOnInfo;
            Log.ConnectionInfo = ci;
            myTable.ApplyLogOnInfo(Log);
        }

        mySections = CrystalReportSource1.ReportDocument.ReportDefinition.Sections;
        foreach (Section mySection in mySections)
        {
            myReportObjects = mySection.ReportObjects;
            foreach (ReportObject myReportObject in myReportObjects)
            {
                if (myReportObject.Kind == ReportObjectKind.SubreportObject)
                {
                    mySubreportObject = (SubreportObject)myReportObject;

                    Database mySubDatabase = mySubreportObject.OpenSubreport(mySubreportObject.SubreportName).Database;
                    myTables = mySubDatabase.Tables;

                    foreach (Table myTable in myTables)
                    {
                        Log = myTable.LogOnInfo;
                        Log.ConnectionInfo = ci;
                        myTable.ApplyLogOnInfo(Log);
                    }
                }
            }
        }

crConnectionInfo = new ConnectionInfo();
        crConnectionInfo.ServerName = "ServerName"; 
        crConnectionInfo.DatabaseName = "DatabaseName";
        crConnectionInfo.UserID = "UserID";
        crConnectionInfo.Password = "Password";