ASP.NET TextBox won't keep value? Very Confused.

Can't get a test box to keep values when I want to read them in my code.

Problem easy to reproduce!

Steps - create new aspx page, drag on a textbox, button, another textbox

Clicking button on middle, should, with the code below, copy the test in box 1 to box 2 - be sure to change the text to something other than 'hello' - and it will revert back to 'hello' every single time.  Do it any way you want, press enter, press the button, do it while half asleep working on a project late into the night...

Thanks for any help - Andrew

Partial Class TestPage
    Inherits System.Web.UI.Page
 
    Protected Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
        Me.TextBox1.Text = "hello"
    End Sub
 
    Protected Sub Button1_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles Button1.Click
        Me.TextBox2.Text = Me.TextBox1.Text
    End Sub
End Class

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