Bypassing CSRF Protection

I have a very, very simple script that's trying to load test a .NET web app. Everything is more or less okay until verification errors because it "Failed to extrack ay value for the variable "R0039__RequestVerificationToken". I'm pretty sure I understand why it's failing (the scripted token value doesn't match the one generated during the verification request), but I have no idea how to fix it. I tried cookie replacement, but either I'm doing it wrong or it doesn't work -- my replacement value is getting emptied each time I verify.



Help?