String Builder Class C# with Example

 using System;
using System.Text;

namespace CSharpFundamentals
{
    class StringBuilderClass
    {
        private static void Main(string[] args)
        {
            StringBuilder msg = new StringBuilder("C# is COOL ");
            Console.WriteLine("Normal String: {0}", msg);

            msg.Append(" and easy to learn");
            Console.WriteLine("After appending: {0}.", msg);

            msg.Replace("C#", "Java");
            Console.WriteLine("After replacing: {0}.", msg);

            msg.Insert(0, "Do you think, ");
            Console.WriteLine("After inserting: {0}?", msg);
        }
    }
}