Security Certificate & .NET

Hi all,

I sometimes use a web debugging tool to check the URL GET strings.  When using it with Explorer directly it will raise a security alert window with:

 "Information you exchange with this site can not be viewed or changed by others.  However there is a problem with the site's security certificate."

"The security certificate was issued by a company you have chose not to trust.  View the certificate to determine whether you want to trust the certifying authority."

"The security certificate date is valid."

"The security certificate has a valid name matching the name of the page you are trying to view"

It then asks if it is ok to proceed

The web tool provides the certificate but I have chosen not to install it in the "Trusted Root Certification Authorities" instead I just choose yes when I need to use it and explorer proceeds on ahead and I can then check what is sent to the server for accuracy.

I would like to be able to do this also with .NET, I have an application that uses the HttpWebRequest/HttpWebResponse classes.  Is there some where I can set a value in the httpwebrequest class that does the same thing as hitting the "yes" button with explorer or do I need to add the web tool's certificate to the "Trusted Root Certification Authorities"?

If I use the web tool with the .NET app currently I get an exception from System.Net.WebException with the message:
"The underlying connection was closed: Could not establish trust relationship with remote server."

Thanks for any help you can give me.