using System;

​

public class Program

{

public static void Main()

{

int i;

bool username_found = false;

string[] username = new string[6] {"annamalai", "valli", "peri", "saras", "arun","lp"};

string[] password = new string[6] {"123", "456", "789", "101112", "131415","123456798"};

​

string username_input, password_input;

​

Console.WriteLine("Enter username:");

username_input = Console.ReadLine();

​

for (i = 0; i < username.Length; i++) {

if (String.Equals(username[i], username_input, StringComparison.OrdinalIgnoreCase)) {

username_found = true;

Console.WriteLine("Enter password:");

password_input = Console.ReadLine();

if (String.Equals(password[i], password_input)) {

Console.WriteLine("Password verified");

} else {

Console.WriteLine("Incorrect password. Please enter correct password");

  return;

}

}

}

​

if (username_found == false) {

Console.WriteLine("Username entered is not found. Please enter correct username.");

}

}

}

​