public class Program

{

    public static void Main()

    {

        // ordinally

        // with constants, it's hard to distill what each param does (without intellisense)

        MyMethod(true, "hi");

        // named arg

        MyMethod(isOn: true, optionalMessage: "hi");

        // mix & match

        // must provide all required params

        MyMethod(true);

        MyMethod(true, optionalMessage: "hi");

        // order doesn't matter

        MyMethod(optionalMessage: "hi", isOn: true);

​

        // variable name gives visibility into the param use

        var isOn = "A" == "A" ? true : false;

        MyMethod(isOn, "hi");

        // use cases for named arguments

        // 1. passing a constant and trying to give context as to what the value does

        // 2. if you have *a lot* of optional args, you skip them via named args

        // illegal

        // Compilation error (line 26, col 3): There is no argument given that corresponds to the required formal parameter 'isOn' of 'Program.MyMethod(bool, string)'

        // MyMethod(optionalMessage: "hi");

        // passing ordinally

        MyMethod2(true, "", "", "", "", "", "", "7");

        // way shorter by passing named arg for last param

        MyMethod2(true, "1", param7: "7");

        // as soon as you stop passing ordinally, all remaining params must be named

        //  Named argument 'param7' is used out-of-position but is followed by an unnamed argument

        // MyMethod2(true, "1", param7: "7", "2");

    }

    public static void MyMethod(bool isOn, string optionalMessage = "")

    {

    }

    public static void MyMethod2(

        bool isOn,

        string param1 = "",

        string param2 = "",

        string param3 = "",

        string param4 = "",

        string param5 = "",

        string param6 = "",

        string param7 = ""

    )

    {

    }

}