Web Forms :: Using URL Access In A Web Application?

I am trying to render an SSRS report via a link in my Web Application. If I use the following code, the report generates as expected:

[Code]....

When that code runs for a certain set of parameters, the following type of string is generated:

[Code]....

The issue is with the url string that is generated, which looks like this:

http://SomeServerPath/Test_rptAuditReport&__VIEWSTATE=%2fwEPDwULLTE2MTY2ODcyMjlkZKWE5%2ftLm5SJFKayb2vmmYGsf7Qc&__SCROLLPOSITIONX=0&__SCROLLPOSITIONY=0&__EVENTTARGET=&__EVENTARGUMENT=&rs%3aCommand=Render&AuditHeaderSK=94&SubmissionSK=122&UserSK=169&SegmentSK=2&AuditformSK=208

Notice that it has inserted some unwanted items into the url string:

&__VIEWSTATE=%2fwEPDwULLTE2MTY2ODcyMjlkZKWE5%2ftLm5SJFKayb2vmmYGsf7Qc&__SCROLLPOSITIONX=0&__SCROLLPOSITIONY=0&__EVENTTARGET=&__EVENTARGUMENT=&

It also does not seem to correctly interperet the "rs:Command", interpreting the ":" as "%3a". If I manually strip that out of the url and fix the %3a to a colon, then the report renders. I understand some of those events are "hidden fields" on a postback and that's why (I guess) they're being included in the url string, but I can't seem to find anyway to suppress them, or to get the colon interpreted correctly in the rs:Command. I've tried to remove the Viewstate with the Page Directive EnableViewState=False, but that doesn't stop the Viewstate from appearing in the string.