title: asp.net tooltip on textbox focus
body: <p>Hi I want to set a tool tip whenever a user clicks on the textbox, I haven't started anything programatically yet since I don't have any idea on how to achieve this, can you please help me? </p>
  
  <p>In the picture, it is shown that a tooltip is shown whenever a user clicks the textbox and is gone when off focus.. </p>
  
  <p><img src="https://i.stack.imgur.com/gx0To.jpg" alt="enter image description here"></p>