title: Validate on text change in TextBox
body: <p>I have implemented validation rules on a textBox in my WinForm and it works well. However it checks the validation only when I tab out of the field. I would like it to check as soon as anything is entered in the box and everytime the content changes. Also I'd like it to check validation as soon as the WinForm opens. </p>
  
  <p>I remember doing this fairly recently by setting some events and whatnot, but I can't seem to remember how.</p>