Post form data to another site with asp.net

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C#

ASP.NET

I would like to transfer some data from my website to the related field of a website, and get
some results from the related websites. In other words, I would like to transfer the data
from the target websites to my system by taking the html codes of the target websites,
uploading data to the related fields, reposting the target websites. I would like to deal
with the operation by using asp.net codes. I tried it with Httpwebrequest object . although
I could get only the related website's html by using this, I cannot post the values that
I want to embed in html. I'm looking for your help