title: button_click upon pressing Return in TextBox - ASP.NET
body: <p>I've got an ASP WebForm with 2 Textboxes and 3 Buttons and I want a specific button_click event to be fired whenever I press return whilst in a TextBox - how would I achieve this?</p>
  
  <p>I tried using the TabIndex-Property, unfortunately that actually only seems to work for tabbing, not for pressing return in a TextBox.</p>
  
  <p>Thanks!</p>