Reporting Services in integrated mode sometimes throws "The operation has timed out."
when render report through application.
The solutions for this problem are listed below:
1. ReportingService2010 reportingService2010=new ReportingService2010();
reportingService2010.Timeout=120000;
or
2. In SharePoint integrated mode, the default timeout is 120 seconds, which is
the default timeout of IIS. We can change it by updating "web.config".
open "c:\inetpub\wwwroot\wss\VirtualDirectories\80\web.config",
locate <httpruntime maxrequestlength="51200"/>,
and change this sentence to
<httpruntime maxrequestlength="51200" executionTimeout="9000"/>