You'll have to enter the data somehow, since you can't really make good dutch-english translations. Maybe a .ini file with a text string at every line? Or a database?
The thing I hate to do is to put all the information at one page, because it is very confusing (sometimes). So you can create a class, like Content.vb, and make a function wich puts the content in the page. If this sounds difficult, it really isn't that hard.
Then, in the Form_Load sub on your aspx page, just call the class, and it will fill out the page, based on data in the querystring (Default.aspx?lang=en) or (Default.aspx?en).