title: Masked TextBox how to not show underlines in text box and allow user to enter 3 digits
body: <p>I am having some troubles with a masked textbox.</p>
  
  <p>How can I hide those underlines which are shown in the textbox by default?!</p>
  
  <p>Also I want the user be able to enter up to 3 digits (he/she can enter atleast 1 and maximum 3 digits). how to set that?</p>