How to post data to another url..?

Question

Hi,
How do I post data from one form to another url & get back to my previous page after getting result from that url..?

I want some sample code for this in ASP.NET with C#.

Consider that I have near about 40 text fields on my webform & I want to post them to some url on button click....& get back to my site..
Please help me asap how to achieve this....?

Thanks