using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        StringBuilder sb = new StringBuilder("Hi, Pirzada"); 

        // 1 - Method Signature: StringBuilder Replace (string oldValue, string newValue);

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

        Console.WriteLine(sb.ToString());

        Console.WriteLine("\n-------------------Separator---------------------\n");

        StringBuilder sb1 = new StringBuilder("Hi, Pirzada"); 

        // 2 - Method Signature: StringBuilder Replace (string oldValue, string newValue, int startIndex, int count);

        sb1.Replace("i", "ello", 1, 4);

        Console.WriteLine(sb1.ToString());

​

​

    }

}