The RouteValueDictionary class enables you to work with collections of key/value pairs that are required in order to use ASP.NET routing. You use the RouteValueDictionary object to define values for the , , and properties. You also use a RouteValueDictionary object when you generate a URL by calling the method and passing a RouteValueDictionary object as a parameter.
Every key in a RouteValueDictionary object must be unique. The RouteValueDictionary class uses case-insensitive ordinal comparison. For more information, see . A key cannot be null.