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

Question

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

    1.Open 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.

 Google Chrome and Mozilla Firefox is currently used in my browser Window.
 Internet Explorer Web Browser is not used in  browser Window.

Thanks In Advance.