Digital Signature

From: Nikhil Garewal (anonymous_at_discussions.microsoft.com)
Date: 04/27/04 

Date: Tue, 27 Apr 2004 14:06:06 -0700

I have created a cert file using makecert.exe & have loaded it to the IIS server, I want to create a digital signature of a userID using my private key. I plav to use the RSACryptoServiceProvider Clas but how do I pass the private key to it instead of it creating a new one.