public static void Main()
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)) {
Console.WriteLine("Enter password:");
password_input = Console.ReadLine();
if (String.Equals(password[i], password_input)) {
Console.WriteLine("Password verified");
Console.WriteLine("Incorrect password. Please enter correct password");
if (username_found == false) {
Console.WriteLine("Username entered is not found. Please enter correct username.");