Question

I have multiple text boxes on a silverlight page. How can I make one of them active so that I will not have to click it to be able to type into it.

Answer 1

You could try

    textBox1.Focus();

This tries to bring the focus over your textbox.

EDIT:
I assume that you want to select your textbox when the page is loaded. In this situation you nead to bring the focus to the silverlight plug-in first and after that to call Focus() method of your textbox.

Here a way to do this:

    System.Windows.Browser.HtmlPage.Plugin.Focus();