Описание тега html.dropdownlistfor
Returns an HTML select element for each property in the object that is represented by the specified expression using the specified list items and tag attributes. Use this tag when you use ASP.net MVC and have a specific question about the `DropDownListFor` extension method
DropDownListFor is a method in the SelectExtensions static class in the System.Web.Mvc.Html namespace of the Microsoft.NET Framework. It returns an HTML select element for each property in the object that is represented by the specified expression using the specified list items and tag attributes.