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112

answers:

1
+3  A: 

you need to set AutoPostBack to true.
see msdn for this:

To have the TextChanged event cause an immediate posting, set the TextBox control's AutoPostBack property to true.

Andreas Niedermair
But remember: "The TextBox Web server control does not raise an event each time the user enters a keystroke, only when the user leaves the control."
Codesleuth
which is caused by definition of `changed` event of the xhtml-tag :)
Andreas Niedermair