ApplyLogOnInfo failed in non-typed Crystal Reports (v10)

[use4forums]

I am having issue changing the DB logon information at the runtime
when loading non-typed Crystal Report file to .NET WinForm
application.

The error message and partial code are listed below. I checked the
connection string values and confirmed they are all correct. Based
on all the document and sample I have, I can't think of anything
missing?

Thanks in advance,
MichaelJ
=========Exception Error Message =======
"Unhandled Exception: Log on failed.
Exception Type: CrystalDecision....
Inner Exception:
Type: System.Runtime.InteropServices.COMException
Message: Logon failed.
Error in File C:\Docume~1\.....\{D371789A....}.rpt
Unable to connect: incorrect log on parameters

Stack Trace: .....
"

=========== partial codes ==========
ReportDocument reportClass = new ReportDocument();

reportClass.Load(ReportFilePath);

TableLogOnInfo logonInfo = new TableLogOnInfo();

foreach(Table table in reportClass.Database.Tables)
{

logonInfo = table.LogOnInfo;

logonInfo.ConnectionInfo.ServerName = "localhost";
logonInfo.ConnectionInfo.DatabaseName = "TestDB";
logonInfo.ConnectionInfo.UserID = "sa";
logonInfo.ConnectionInfo.Password = "pswd";
// Apply the connection information to the table.
table.ApplyLogOnInfo(logonInfo);
}

this.rptViewer.ReportSource = reportDoc;

[use4forums]

The the last statement of the partial codes in the question I posted
should be read like below. Sorry for the typo.

this.rptViewer.ReportSource = reportClass;

thanks
Michael