using System;

​

public class Program

{

    public static void Main()

    {

        //first validation

        //if user Exist

        //second

        //credentials is match with input

        //after validation

        //pirnt welcome userid

        string user;

        string password;

        Console.Write("Enter User : ");

        user = Console.ReadLine();

        Console.Write("Enter Password : ");

        password = Console.ReadLine();

        credValidation(user, password);

    }

​

    public static void credValidation(string a1, string a2)

    {

        if (a1 == "esubala")

        {

            if (a2 == "password_1")

            {

                Console.WriteLine("Successfully Login");

                Console.WriteLine("The user exist");

                Console.WriteLine("Welcome User: ESubala");

            }

            else

            {

                Console.WriteLine("Incorrect Password!");

            }

        }

        else if (a1 == "eguiling")

        {

            if (a2 == "password_2")

            {

                Console.WriteLine("Successfully Login");

                Console.WriteLine("The user exist");

                Console.WriteLine("Welcome User: EGuiling");

            }

            else

            {

                Console.WriteLine("Incorrect Password!");

            }

        }

        else

        {

            Console.WriteLine("The user does not exist");

        }

    }

}