title: Required property in User Control
body: <p>I just made an User Control with some parameters to be filled.</p>
  
  <pre><code>&lt;uc1:Graph ID="uc1Graph" runat="server" property1="Name" property2="XValue" /&gt;
  </code></pre>
  
  <p>Now, my question is:</p>
  
  <ul>
  <li>How to make the property1 be a required field?</li>
  </ul>
  
  <p>The developer must fill the Name of graph(property1), otherwise it must not work and some error message should appear in runtime, ooor even better, in the design mode</p>
  
  <p>Thank you for your time ! :D</p>