asp.net mvc - How to render an action link with an image? -

i know use html.actionlink() render textual <a href..."> links actions.

how render link action has underlying image link?

<a href="foo"><img src="asdfasdf"/></a> 

here code imagelink htmlhelper extension use.

    /*      * image link html helper      */      /// <summary>     /// return image link     /// </summary>     /// <param name="helper"></param>     /// <param name="imageurl">url image</param>     /// <param name="controller">target controller name</param>     /// <param name="action">target action name</param>     /// <param name="linktext">anchor text</param>     public static string imagelink(this htmlhelper helper, string imageurl, string controller, string action, string linktext)     {         return imagelink(helper, null, controller, action, linktext, imageurl, null, null, null, null);     }      /// <summary>     /// return image link     /// </summary>     /// <param name="helper"></param>     /// <param name="imageurl">url image</param>     /// <param name="controller">target controller name</param>     /// <param name="action">target action name</param>     /// <param name="linktext">anchor text</param>     /// <param name="htmlattributes">anchor attributes</param>     public static string imagelink(this htmlhelper helper, string imageurl, string controller, string action, string linktext, object htmlattributes)     {         return imagelink(helper, null, controller, action, linktext, imageurl, null, null, new routevaluedictionary(htmlattributes), null);     }      /// <summary>     /// return image link     /// </summary>     /// <param name="helper"></param>     /// <param name="imageurl">url image</param>     /// <param name="controller">target controller name</param>     /// <param name="action">target action name</param>     /// <param name="linktext">anchor text</param>     /// <param name="htmlattributes">anchor attributes</param>     /// <param name="routevalues">route values</param>     public static string imagelink(this htmlhelper helper, string imageurl, string controller, string action, string linktext, object htmlattributes, object routevalues)     {         return imagelink(helper, null, controller, action, linktext, imageurl, null, null, new routevaluedictionary(htmlattributes), new routevaluedictionary(routevalues));     }      /// <summary>     /// return image link     /// </summary>     /// <param name="helper"></param>     /// <param name="id">id of link control</param>     /// <param name="controller">target controller name</param>     /// <param name="action">target action name</param>     /// <param name="strothers">other url parts querystring, etc</param>     /// <param name="strimageurl">url image</param>     /// <param name="alternatetext">alternate text image</param>     /// <param name="strstyle">style of image border properties, etc</param>     /// <returns></returns>     public static string imagelink(this htmlhelper helper, string id, string controller, string action, string linktext, string strimageurl, string alternatetext, string strstyle)     {         return imagelink(helper, id, controller, action, linktext, strimageurl, alternatetext, strstyle, null, null);     }      /// <summary>     /// return image link     /// </summary>     /// <param name="helper"></param>     /// <param name="id">id of link control</param>     /// <param name="controller">target controller name</param>     /// <param name="action">target action name</param>     /// <param name="linktext">anchor text</param>     /// <param name="strimageurl">url image</param>     /// <param name="alternatetext">alternate text image</param>     /// <param name="strstyle">style of image border properties, etc</param>     /// <param name="htmlattributes">html attribues link</param>     /// <returns></returns>     public static string imagelink(this htmlhelper helper, string id, string controller, string action, string linktext, string strimageurl, string alternatetext, string strstyle, idictionary<string, object> htmlattributes, routevaluedictionary routevalues)     {         // build img tag         tagbuilder image = new tagbuilder("img");         image.mergeattribute("src", strimageurl);         image.mergeattribute("alt", alternatetext);         image.mergeattribute("valign", "middle");         image.mergeattribute("border", "none");          tagbuilder span = new tagbuilder("span");          // create tag builder         var anchor = new tagbuilder("a");         var url = new urlhelper(helper.viewcontext.requestcontext).action(action, controller, routevalues);          // create valid id         anchor.generateid(id);          // add attributes         //anchor.mergeattribute("href", "/" + controller + "/" + action); //form target url         anchor.mergeattribute("href", url);         anchor.mergeattribute("class", "actionimage");         if (htmlattributes != null)             anchor.mergeattributes(new routevaluedictionary(htmlattributes));          // place img tag inside anchor tag.         if (string.isnullorempty(linktext))         {             anchor.innerhtml = image.tostring(tagrendermode.normal);         }         else         {             span.innerhtml = linktext;             anchor.innerhtml = image.tostring(tagrendermode.normal) + " " + span.tostring(tagrendermode.normal);         }          // render tag         return anchor.tostring(tagrendermode.normal); //to add </a> end tag     }