title: How to display an error message box in a web application asp.net c#
body: <p>I have an ASP.NET web application, and I wanted to know how I could display an error message box when an exception is thrown. </p>
  
  <p>For example, </p>
  
  <pre><code>        try
          {
              do something
          }
          catch 
          {
              messagebox.write("error"); 
              //[This isn't the correct syntax, just what I want to achieve]
          }
  </code></pre>
  
  <p>[The message box shows the error]</p>
  
  <p>Thank you</p>