title: How can i check for character , number and special characters in a string?
body: <p>I want to user to enter only numbers and characters in textbox i.e no special charaters.
  I don't want to use key press event of textbox.</p>
  
  <p>As i need same validation in gridview.</p>
  
  <p>So i want to validate whole string.</p>
  
  <p>Thanks in advance.</p>