For security reasons DTD is prohibited in this XML document

Hello All,

I have a very big Dataset which pulls up millions of rows.

When I pass parameters from Windows forms to run on Reportviewer through webservice it is giving me "System.OutOfMemory" Exception and when I pass same parameters on the server(i.e. http:\\server\reportmanager) it is giving me this error "For security reasons DTD is prohibited in this XML document. To enable DTD processing set the ProhibitDtd property on XmlReaderSettings to false and pass the settings into XmlReader.Create method"

I have no problem when I pass small dataset.

Please help me solve this annoying this problem.