Auto-Updating, and Progress Bar

[whosyodaddy]

Hello All. I know this is sorta a large question to ask.... but, I think It's simple to answer.... Ok, here it is, how do you make it so when somebody clicks on a button it searches for updates for that program from a website? For example, when you click on it, it goes to my website, and a certain part of the website tells the program that there is a newer version, so it downloads it. It shows a progress bar for the download too. Thank You.