Simple c# application

I need a simple project with a small GUI. This application should be used to quickly notice when a given word is published on a site The application should on a given interval read URL adresses and serch them for a specific keyword. When this keyword i found and if it contains a link, it should directly open Firefox or Explorer with that link. The GUI: In the GUI it should be possible to enter 1-3 different URL adresses and a keyword to every URL (1-3 keywords). It should also be possible to enter a ping interval. Also a start and a stop button should be visibile. When the startbutton is pressed, the application stars running and after the inteval number of seconds (10 for example), it should get the URLs from the adresses, search them for keywords, and if keyword is found, open Firefox or Explorer. If explorer or firefox is opened, the application then stops. I will send you an image on how I want this to look like. The final project should contain both a working exe file and the code.