MVC AjaxHelper Extension - The system cannot find it?

I am trying to build a AjaxHelper extension and seem to be running into a SNAFU.

View:

<%= Ajax.DeleteLink("Delete", "LicenseDelete", "Directory", new { LicenseID = license.ID }, new { @class = "directory button" }); %>

Extension:

using System;
using System.Collections.Generic;
using System.Web.Mvc;
using System.Linq.Expressions;
using System.Web.Routing;
using System.Web.Mvc.Ajax;

namespace RainWorx.FrameWorx.MVC
{
    public static class HtmlExtensions
    {
        public static MvcHtmlString DeleteLink<TModel>(this AjaxHelper<TModel> ajaxHelper, string linkText, string actionName, string controllerName, object routeValues, object htmlAttributes)
        {
            return ajaxHelper.ActionLink(linkText
                                       , actionName
                                       , controllerName
                                       , routeValues
                                       , new AjaxOptions { Confirm = "Are you sure you want to delete this item?",
                                                           HttpMethod = "DELETE",
                                                           OnSuccess = "function() { window.location.reload(); }" }
                                       , htmlAttributes);
        }
    }
}

Browser result:

Server Error in '/' Application.

Compilation Error

Description: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.

Compiler Error Message: CS1061: 'System.Web.Mvc.AjaxHelper<RainWorx.FrameWorx.MVC.ViewModels.DirectoryEdit>' does not contain a definition for 'DeleteLink' and no extension method 'DeleteLink' accepting a first argument of type 'System.Web.Mvc.AjaxHelper<RainWorx.开发者_如何学JAVAFrameWorx.MVC.ViewModels.DirectoryEdit>' could be found (are you missing a using directive or an assembly reference?)

What (obvious) thing did I miss? I can swear the first argument in my extension method does accept pretty much any model I choose to throw at it.

TIA

-kb

You likely either need to register the namespace in web.config or in the view itself.

View example using WebForms:

<%@ Import Namespace="RainWorx.FrameWorx.MVC" %>

http://msdn.microsoft.com/en-us/library/eb44kack.aspx

View example using Razor View Engine w/ C#:

@using RainWorx.FrameWorx.MVC

View example using Razor View Engine w/ VB.NET:

@Imports RainWorx.FrameWorx.MVC

How do I import a namespace in Razor View Page?

Web.Config example:

<system.web>
    <compilation>
        <add assembly="RainWorx.FrameWorx.MVC" />
    </compilation>
</system.web>

http://msdn.microsoft.com/en-us/library/bfyb45k1.aspx

Include your extension namespace in your view. That's almost always the cause.