[C#] Swapping the Values of Two Variables

1. Classic Method

 Declare an additional temporary variable, copy the value or reference of one of the two variables into it, and then perform the swap.

var a = 10;
var b = 20;
var temp = a;
a = b;
b = temp;
    

2. Modern Method (C# 7.0 or later)

 Using a tuple, you can achieve the swap in a single line.

(b, a) = (a, b)