Topic: Default behavior of the "Enter" button on an .aspx page for ASP.Net
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Description:  Sometimes if you have multiple buttons on your page and you click "Enter", the button that you want to run, doesn't execute.

A quick way to handle this is to set the tab order of the input controls.  Set the button' tab Index to 0 or lower than all of the other input controls and it will fire first when you hit the enter button.