How to fill in html textbox from (c# ) windows application

I would like to do the following from a windows application:

1. Manually Opened a browser and navigate to a URL.
2. When i am at the correct URL in my browser window, i want to fill in data in the html textboxes on that page from my windows application.
3. When that is done i want to press a button.

Description:-
1.The URL (https://www.exple.com/login.html ) had already opened in anyone web browsers such as Mozilla Firefox or Google Chrome on local System.
It consists of Two Textboxes such as Username and Password .
2.I Want to fill in data in Username & Password Textbox on login html page
3.The Input (username & Password ) data is taken from C# Windows Application to URL(https://www.exple.com/login.html ) When clicked Submit Button in C# Windows Application.
Note:
Google Chrome and Mozilla Firefox is currently used in my browser Window.
Internet Explorer(IE) never used in browser Window.



http://stackoverflow.com/questions/10348724/how-to-fill-in-html-textbox-from-c-windows-application

http://www.dotnetfunda.com/forums/thread9486-how-to-fill-in-html-textbox-from-csharp-windows-application.aspx


http://www.c-sharpcorner.com/Forums/Thread/170583/how-to-fill-in-html-textbox-from-C-Sharp-windows-application.aspx


http://www.dotnetspider.com/forum/309113-How-fill-html-textbox-from-c-windows-application.aspx

http://www.codeproject.com/Questions/376638/How-to-fill-in-html-textbox-from-csharp-windows-ap

http://www.dotnetspark.com/Forum/3353-how-to-fill-html-textbox-from-c-sharp--windows.aspx

http://www.dotnetexpertsforum.com/viewtopic,p,4680.html#4680