Problem when passing parameters to Reporting services

Hello,
Am new to reporting services and having problems passing parameters.
I am using ASP.Net with .NetFramework 1.1 and am trying out reporting
services 2005.
I am using an object of the ReportExecutionService along with the render
method.
I have tried a few differnet examples and none have worked. Does anyone have
any working piece of code that i can try?
Thanks in advance
Regards
IshanJust to add to the question...
There are at least two Render methods specified in the documentation.
One is a call with 12 parameters one of which is the Report parameters.
The other Render method comes from the ReportExecution service and takes
just 5 parameters and the Report Parameters are set using a call to a separate
SetReportExecutionParameters.
Which of these methods has anyone used successfully ? Getting very strange
errors regarding Parameters from both of these Render routines.