Disposable HtmlString Extension for Authorization purposes

Question

I'm intending to create an extension for MVC that looks like this:

public static class DivExtension
{

    public static MvcHtmlElement BeginDiv(this HtmlHelper helper)
    {

        return new MvcDiv(helper.ViewContext).BeginDiv("","");
    } 
    public static MvcHtmlElement BeginDiv(this HtmlHelper helper, string id)
    {

        return new MvcDiv(helper.ViewContext).BeginDiv(id,"");
    } 
}

In Razor I could use it like this:

@{using(Html.BeginDiv())
  {
        <text>
              This should appear inside a div <input type="text" value="oi" />
        </text>
   }
}

Which would generate the following HTML output:

 <div>
   This should appear inside a div <input type="text" value="oi" />
 </div>

But imagine that instead of just creating a div, my code would receive a string representing roles and, if the logged in user does not belong to the specified Roles, the HTML within this extension should be suppressed:

public static class HtmlAuthSuppressor
{

    public static MvcHtmlElement AuthHTML(this HtmlHelper helper, string roles)
    { 
        //some code that would allow suppression
    }  
}

and If I use like this:

<b>Do you see something below?</b>
@{using(Html.AuthHTML("Role_Super_User"))
  {
        <text>
              Congratz!!! You can see this, u are super, indeed. <input type="text" value="oi" />
        </text>
   }
}

The final HTML output, in case the user does not belong to the specified role, would be:

<b>Do you see something below?</b>

Is that possible?

UPDATE: I know I could generate an HTML like this:

   <b>Do you see something below?</b> 
     <!--   
              Congratz!!! You can see this, u are super, indeed. <input type="text" value="oi" />
        --!>

But that would reveal something to the client that I wouldn't like to reveal, besides making the response unnecessarily heavier.

Answer 1

You don't need to build an extension for that.. just do this:

<b>Do you see something below?</b>

    @if (Request.IsAuthenticated && User.IsInRole("Role_Super_User"))
    {
        <text>
              Congratz!!! You can see this, u are super, indeed. <input type="text" value="oi" />
        </text>
    }