I have a page with couple of textboxes and 2 buttons. One of textboxes has Autopostback=true. If textbox with autopostback=true is empty and I type something into it and click, using my mouse, on any of the buttons all events fire as expected Page_Load, TextChanged, Button.Click. However if textbox is not empty (already contains some text) and I just change this text and click on the button I get only Page_Load and Textchanged fired, no Button.Click event. Does anyone knows what is the problem and how to workaround it?