Custom HTML Helper in ASP.NET MVC3

@Html.TextBox("Email")

<input id="Email" name="Email" type="text" value="" />

using System.Web.Mvc;

public class MyLabel
{
    public static MvcHtmlString Label( string target, string text )
    {
        string label = String.Format( "<label for='{0}'>{1}</label>", target, text );
        return new MvcHtmlString( label );
    }
}

@using MyHTMLHelper
@MyLabel.Label("Email", "Your Email : ")

<label for='Email'>Your Email : </label>

public static class LabelExtensions
{
    public static MvcHtmlString MyLabel( this HtmlHelper htmlHelper,
 string target, string text )
    {
       string label = String.Format( "<label for='{0}'>{1}</label>", target, text );
       return new MvcHtmlString( label );
    }
}

@using MyHTMLHelper
@Html.MyLabel("Email","Your Email : ")