Program using string builder class

Write a program using string builder class.

public void strignbuilder()

        {

            StringBuilder sb = new StringBuilder("Hi there.");

            Console.WriteLine("{0}", sb);

            sb.Replace("Hi", "Hello");

            Console.WriteLine("{0}", sb);

    public void reverse()

        {

            string[] s = new string[3];

            s[0] = "Number1";

            s[1] = "Number2";

            s[2] = "Number3";

            Console.WriteLine("The elements in string are");

            foreach (string c in s)

            {

                Console.WriteLine("{0}", c);

            }

            List<string> rever = new List<string>();

            rever = s.Reverse<string>().ToList<string>();

            Console.WriteLine("The elements of string in reverse order are");

            foreach (string c in rever)

            {

                Console.WriteLine("{0}:", c);

            }

        }