How to simulate Nothing from a deep link

Hello-

I'm working on an app that will create an HTTP connection to the SSRS server to gather a PDF generated by SSRS and place it on the LAN. looks something like this :

http://server/ReportServer?%2fDEV%2frpt_Sheet&rs%3aCommand=Render&rc:Toolbar=false&userID=NULL&StoreID=23&rs:Format=PDF

We have a few reports where 1 or more parameters can be null, but I'm having one heck of a time trying get this to work with a null value. Does anyone know what value is actually passed to SSRS when a parameter is NULL?

I have tried Nothing, but to no avail.

Thanks in adavance,

Tristan

Do not include that parameter in the link and set its default value as null or send something like this:

parameter name = "param1"

&param1%3aisnull=True

http://reportserver/?%2fReport1Test&param1%3aisnull=True&rs%3aParameterLanguage=&rc%3aParameters=Collapsed

Maciej