Html.TextboxFor (Modell => model.Username) gibt Fehler in MVC3 RC2 - asp.net-mvc-3

Dies funktionierte vorher in RC1, aber in RC2 funktionierte nicht. Irgendeine Idee was ist falsch?

Line 97:         @Html.LabelFor(model => model.Username)
Line 98:         @Html.TextboxFor(model => model.Username) ---> ERROR HERE
Line 99:         @Html.ValidationMessageFor(model => model.Username)

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.HtmlHelper<Learning.Ajax.Models.Order>" does not contain a definition for "TextboxFor" and no extension method "TextboxFor" accepting a first argument of type "System.Web.Mvc.HtmlHelper<Learning.Ajax.Models.Order>" could be found (are you missing a using directive or an assembly reference?)

Antworten:

Sollte sein TextBoxFor (mit Kapital B)