ASP.Net / ASP.Net MVC-- request contents of one page from another?

I have to write a page method in ASP.Net that returns a JSONP result. In order to build its payload for return howe开发者_如何学编程ver, it has to read a URL from another domain, passing it some parameters that were passed to it originally.

I suppose I'll need to screen scrape the results to see if the login credentials worked. Could point me toward ideas that might begood for ASP.Net or ASP.Net MVC? Thanks!

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I've done this by opening a hidden iframe and traversing the DOM