Represents an optional parameter that is used by the MvcHandler class during routing.
System.Web.Mvc (in System.Web.Mvc.dll)
public sealed class UrlParameter
Contains the read-only value for the optional parameter.
The following route is defined by default in the Global.asax file:
In this default route, controller is set to "Home", action is set to "Index", and id is set to Optional. If no value is passed for id, the MvcHandler class ignores the id parameter.
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Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.