If those answers do not optionsl address your question, please ask a new question. reeference A ref parameter is a very different use case. A method with an optional parameter can be called with only some of its parameters specified. Each of the parameters is optional. This page should helpto clear up some of that confusion. If you have any suggestions for howit can be made clearer, please mail me.Microsoft also has a goodpage about this topic (which I parametter exactly the same terminology as this page - let me knowif they appear to disagree).Note: Lee Richardson has written a complementary articleto this optiomal, particularly for those who learn well with pictures.
Optional arguments enable you to omit arguments for some parameters. Both techniques can rrference used with methods, indexers, constructors, and delegates.When you use named and optional arguments, the arguments are evaluated in the order in which they appear in the argument list, not the parameter list.Named and optional parameters, when used together, enable you to supply arguments for only a few refeeence from a list of optional parameters.
This capability greatly facilitates calls to COM interfaces such as the Microsoft OfficeA parameter declared with an out modifier is an output parameter. Similar to a reference parameter, an output parameter does not create a new storage location. Instead, an output parameter represents the same storage location as the variable given as the argument in the method invocation.When a formal parameter is an output parameter, the corresponding argument in a method invocation must consist of the keyword out followed by a variable-reference (Section optional output parameter c# reference of the same type as the formal parameter.
Parameter reference c# output optional