title: Textbox Onclick = clear value , on exit from textbox set the default value?
body: <p>I have this in the </p>
  
  <pre><code>&lt;asp:TextBox ID="svv" OnClick="this.value=''" runat="server"&gt;Hello...&lt;/asp:TextBox&gt;
  
  OnClick="this.value=''" // On mouse click in textbox it will deleted the text.
  </code></pre>
  
  <p>How can I set something like </p>
  
  <p><code>Unclick"this.defautlvalue"; // something like this.</code></p>
  
  <p>So, when I click the control it will clear the value, if I exit from the control (for example, clicking another textbox) it will return the default value of the textbox.</p>
  
  <p>Thanks</p>