Extending HtmlHelper

Helpers.cs

 using System.Web;  
 using System.Web.Mvc;  
 using System.Web.Routing;  
 namespace mvc.Helpers  
 {  
   public static class ImageHelpers  
   {  
     public static IHtmlString Image(this HtmlHelper helper, string id, string url, string alternateText)  
     {  
       return Image(helper, id, url, alternateText, null);  
     }  
     public static IHtmlString Image(this HtmlHelper helper, string id, string url, string alternateText, object htmlAttributes)  
     {  
       var builder = new TagBuilder("img");  
       builder.GenerateId(id);  
       builder.MergeAttribute("src", url);  
       builder.MergeAttribute("alt", alternateText);  
       builder.MergeAttributes(new RouteValueDictionary(htmlAttributes));  
       return new MvcHtmlString(builder.ToString(TagRenderMode.SelfClosing));  
     }  
   }  
 }  

index.cshtml

 @{  
   ViewBag.Title = "Home Page";  
 }  
 @using mvc.Helpers;  
 @Html.Image("img1", "~/Content/XBox.jpg", "XBox Console")