Pass a string to a website input box from a C# winforms page?

Bobby, thank you for your reply. I do not know why the complete information that I posted did not appear, so I apologize. I gave a precise example of what I was trying to do. I have been using Code Project for over 15 years and it gets less friendly every year. I looked into Selenium and I do not understand how to install it or what it even does. The download does not have an executable. But it was important to me to make time to thank you for your advice and effort. Best Regards, Pat.

Hello Richard. Thank you for your response. Please see the following:

The Webpage textbox looks like this:



Beginning, let me thank you. I do not think that I explained it properly, which happens when you are trying not to reveal private information. First, the page that is 'sending' the data is not mypage.ascx ... it is mypage.cs (Winforms, not a web page). Second, the website is not mine. It is a resource. But because it is public, let me lift the veil off it. I am trying to use a site called (www.decodethis.com). It is totally legitimate to use it, but many of my customers that use the site by reference make mistakes when transferring the 17 digit VIN number to the site manually. My idea was to have them enter the information inside the application that I wrote and have it passed to the 'decodthis' page to have it processed and get a result. I am not sure that it is even possible to do this, but since it should not matter whether the number to be decoded was entered manually or automatically, it seemed to make sense to do it this way. If it would help. I could make a webpage on my end and then use aspx.cs code to accomplish the same thing if that would work. But I prefer to use the actual application if possible. With that said, all the information about the web text box is visible using the element examination feature. SO ... perhaps using the real-life naming on the actual page ... could you please suggest a way to accomplish this task (if it can be done at all?). All I want to do is pass the information from the desktop application (main.cs) to the webpage (www.decodethis.com) automatically. Thank you again!