You can do this many ways.

1. Querystring. "WebForm2.aspx?MyText=testtext"

2. Server.Transfer (I haven't done this, but I think you can do this.)

3. Session variable. Before you leave page 1, set a session variable:
Session("MyValue") = text1.text
In page 2, get the value:
text2.text = Session("MyValue")