C# optional parameters and named parameters
Optional parameters
static void test1() { func1("A"); func1("B", 30); Console.ReadKey(); } static void func1(string name, int age = 20) { Console.WriteLine("Name: " + name + "\t Age: " + age); }
Named parameters
static void test2() { func2("C", 40); func2(age: 50, name: "D"); Console.ReadKey(); } static void func2(string name, int age) { Console.WriteLine("Name: " + name + "\t Age: " + age); }
Optional parameters combined with named parameters
static void test3() { func3("E"); func3("F", 10, false); func3("G", 15); func3("H", isMale: false); Console.ReadKey(); } static void func3(string name, int age = 20, bool isMale = true) { Console.WriteLine("Name: " + name + "\t Age: " + age + "\t IsMale: " + isMale); }

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The history and evolution of C# and C are unique, and the future prospects are also different. 1.C was invented by BjarneStroustrup in 1983 to introduce object-oriented programming into the C language. Its evolution process includes multiple standardizations, such as C 11 introducing auto keywords and lambda expressions, C 20 introducing concepts and coroutines, and will focus on performance and system-level programming in the future. 2.C# was released by Microsoft in 2000. Combining the advantages of C and Java, its evolution focuses on simplicity and productivity. For example, C#2.0 introduced generics and C#5.0 introduced asynchronous programming, which will focus on developers' productivity and cloud computing in the future.

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