Well here is my way on how to handle the ENTER key on the TextBox in asp.net so it execute my method call instead the default form action.
I have a textbox and a linkbutton that invokes the search, but I also would like to hook up to that linkbutton when I press ENTER on the TextBox so I would perform the search, but by default it would invoke the form submit which is not what we want. So here is a quick solution using javascript, I know there are other one but this one is short and it works well.