HTTP POST in C# CodeBehind and Async Encryption

[jacob.eiler]

I need to create an HTTP POST using variables in a page and then
perform the post, transferring those variables to another form for
processing. Basically, I need to know how to submit the contents of a
form without actually having a form and POST rather than send via
querystring.

In addition, I need to encrypt that post using public key - private key
(asynchronous) encryption using pem certificates.

Can anyone help me on either aspect of this?

Thanks,

Jacob