コードだけじゃない。
この仕事の、全部。

var num1 = 1;var num2 = 3; var temp = num1;num1 = num2;

var num1 = 1;var num2 = 3; num1 = num2;num2 = num1;

var num1 = 1;var num2 = 3; (num1, num2) = (num2, num1); 

var user = (1, "Taro", "Japan");var user2 = (2, "Hisashi", "Japan"); Console.WriteLine("Id" + user.Item1 + "名前:" + user.Item2 + "住所:" + user.Item3);Console.WriteLine("Id" + user2.Item1 + "名前:" + user2.Item2 + "住所:" + user2.Item3);

var userList = new List<(int No,string Name,string address)>();userList.Add((1, "Taro", "Japan"));userList.Add((2, "Hisashi", "Japan")); foreach (var user in userList)

var nums = (1,2); var result = Add(nums);Console.WriteLine("結果は:" + result);Console.ReadLine();