问将水晶报表导出到.NET中的pdf时出错“数据库登录失败”

EN

public class CryRepWebService : System.Web.Services.WebService
    {       
        [WebMethod]
        public string InvoiceReportCry(int Invoiceid, int docType, string Proj)
        {
            string project;
            int docTypes;
            int InvoiceIds;
            try
            {
                ReportDocument cryRpt = new ReportDocument();
                cryRpt.Load(Server.MapPath("~/Reports/myreport.rpt"));
                string USERNAME = "useruser";//Default user Name
                string PWD = "pwdpwd$";//Default pwd Name
                string DSN_NAME = "mydsn";
                string INITIAL_CATALOG = "dbname";
                string serverName = (string)Registry.GetValue(@"HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBC.INI\" + DSN_NAME, "Server", null);
                cryRpt.SetDatabaseLogon(USERNAME, PWD, serverName, INITIAL_CATALOG);
                // create the connection information
                ConnectionInfo conRpt = new ConnectionInfo();
                conRpt.ServerName = serverName;
                conRpt.DatabaseName = INITIAL_CATALOG;
                conRpt.UserID = USERNAME;
                conRpt.Password =PWD;
                // apply connection information to the report tables
                Tables rptTables = cryRpt.Database.Tables;
                for (int i = 0; i < rptTables.Count; i++)
                {
                    CrystalDecisions.CrystalReports.Engine.Table rptTable = rptTables[i];
                    TableLogOnInfo tblInfo = rptTable.LogOnInfo;
                    tblInfo.ConnectionInfo = conRpt;
                    // next table
                }
                // if the report contains sub reports, you will need to set the connection info there too
                if (cryRpt.Subreports.Count > 0)
                {
                    for (int i = 0; i < cryRpt.Subreports.Count; i++)
                    {
                        using (ReportDocument rptSub = cryRpt.OpenSubreport(cryRpt.Subreports[i].Name))
                        {
                            Tables rptTables1 = rptSub.Database.Tables;
                            for (int j = 0; j < rptTables.Count; j++)
                            {
                                CrystalDecisions.CrystalReports.Engine.Table rptTable = rptTables1[i];
                                TableLogOnInfo tblInfo = rptTable.LogOnInfo;
                                tblInfo.ConnectionInfo = conRpt;
                                // next table
                            }
                            rptSub.Close();
                        }
                    }
                }
                ParameterValues crParameterValues = new ParameterValues();
                ParameterDiscreteValue crParameterDiscreteValue = new ParameterDiscreteValue();
                ParameterDiscreteValue crParameterDiscreteValue1 = new ParameterDiscreteValue();
                ParameterDiscreteValue crParameterDiscreteValue2 = new ParameterDiscreteValue();
                          
                cryRpt.SetParameterValue("@Invoiceid", Invoiceid);
                cryRpt.SetParameterValue("@docType", docType);
                cryRpt.SetParameterValue("@Proj", Proj);
                project = Proj;
                docTypes = docType;
                InvoiceIds = Invoiceid;
                bool folderExists = Directory.Exists(@"D:\CrystalReports\Test_Pdf");
                if (!folderExists)
                    Directory.CreateDirectory(@"D:\CrystalReports\Test_Pdf");
                cryRpt.ExportToDisk(ExportFormatType.PortableDocFormat, @"D:\CrystalReports\Test_Pdf\test-" + Invoiceid + ".pdf");
                return project + InvoiceIds + docTypes;
            }
            catch (Exception ex)
            {
                ExceptionLogging.SendErrorToText(ex);
                return null;
            }
        }
    }

Windows 7 Professional (64-bit)
Visual Studio 2015       Sql   
Server 2012 
ODBC Driver - Sql Server
SAP Crystal Reports 2016 (SP6) (version 14.2.6.2839)
SAP Crystal Reports runtime engine for .NET Framework(64-bit)(version 13.0.30.3805)       
SAP Crystal Reports, version for Microsoft Visual Studio (version 13.0.30.3805)       
IIS (7.5)

  Windows Server 2012 R2 Standard (64-bit)
  Visual Studio 2015
  Sql Server 2019  
  ODBC Driver - Sql Server Native Client 10.0
  SAP Crystal Reports 2016 (SP4) (version 14.2.4.2410)  
  SAP Crystal Reports 2016 (SP9) update (version 14.2.9.3791)
  SAP Crystal Reports runtime engine for .NET Framework(64-bit) (version 13.0.30.3805)  
  SAP Crystal Reports, version for Microsoft Visual Studio (version 13.0.30.3805)  
  IIS (8.5)