using System; namespace Test { class Test { static void Main() { string s1, s2; s1 = "foo"; s2 = "bar"; Console.WriteLine("s1: {0}, s2: {1}", s1, s2); Swap(ref s1, ref s2); Console.WriteLine("s1: {0}, s2: {1}", s1, s2); int i1, i2; i1 = 0;…