Applying a custom dataset to the subreport fails

Question

System.Runtime.InteropServices.COMException (0x80040203): The communication channel has not been created.
   at CrystalDecisions.ReportAppServer.Controllers.DatabaseControllerClass.ReplaceConnection(Object oldConnection, Object newConnection, Object parameterFields, Object crDBOptionUseDefault)
   at CrystalDecisions.CrystalReports.Engine.Table.SetDataSource(Object val, Type type)
   at CrystalDecisions.CrystalReports.Engine.Table.SetDataSource(DataTable dataTable)
exception raises when I try to pass a custom Dataset to a subreport's table via Table.SetDataSource.
Does anybody knows what happens?
ps: CR for MS VisualStudio 2005

Answer 1

I use Visual Studio 2005 and Visual Basic, making a report web site with aspx
..NET. The code listed below is in a separate class supporting an aspx. Here
is the core of my code
I have report and subreport in my web page
At startup the report including its subreport shows up fine. If I need a
refresh, e.g. change to 75% size, go to another page or similar, the code is
run again but then fails on the statement
Report2.SetDataSource(SubreportDataValues)
and the exception message is "The communication channel has not been created."
It is a System.Runtime.InteropServices.COMException that occurred in
CrystalDecisions.CrystalReports.Engine.dll
If I "let it run", my web page shows up with a message saying:
This group section cannot be printed because its condition field is
nonexistent or invalid.
Format the section to choose another condition field. Error in File
C:\DOCUME1\JAKKI\LOCALS1\Temp\MainReport
{8E62F51C-012E-410F-BF4A-CBF9E9AB52D5}.rpt: Invalid group condition.
I believe this is a bi-effect of the real problem. The real problem, I
think, is that the communication between the Crystal subreport (i.e. report
engine) and my data is lost in the postback. (I insert "my own" data into the
two arraylists and store them in session variables for persistance. Changing
the order of SetDataSource (main report before subreport or vice versa) has
no effect.)
I guess the question is "How can I retain (or re-establish) the
"communication channel" (I don't know the details about what that is -
between what?) (for the subreport) across web page refresh (i.e. postback)"?
When I look at the web pages of Business Objects (the vendor of Crystal
Reports) it looks as this is a bug in Crystal Reports, but that a fix (patch)
can not be installed as long as I use Crystal Reports embedded in Microsoft
Visual Studio.
Is there any Microsoft or Business Objects professionals (or other) who can
tell me how to get around this problem? Advise a method to retain a subreport
in a main report across postbacks?
Please help me.