title: How to override an existing extension method
body: <p>I want to replace extension methods included in the .NET or ASP MVC framework by my own methods.</p>
  
  <p>Example</p>
  
  <pre><code>public static string TextBox(this HtmlHelper htmlHelper, string name)
  {
     ...
  }
  </code></pre>
  
  <p>Is it possible? I can't use the override or new keyword.</p>