Simple function to let the user enter a password for C# console applications.

ConsoleReadPassword.cs

static string ConsoleReadPassword()
{
    StringBuilder stringBuilder = new StringBuilder();
    ConsoleKeyInfo keyInfo = Console.ReadKey(true);

    while (keyInfo.Key != ConsoleKey.Enter)
    {
        if (keyInfo.Key == ConsoleKey.Backspace)
        {
            stringBuilder.Remove(stringBuilder.Length - 1, 1);
            Console.CursorLeft = Console.CursorLeft - 1;
            Console.Write(" ");
            Console.CursorLeft = Console.CursorLeft - 1;
        }
        else if (!char.IsControl(keyInfo.KeyChar))
        {
            Console.Write("*");
            stringBuilder.Append(keyInfo.KeyChar);
        }
        keyInfo = Console.ReadKey(true);
    }

    Console.Write("\n");

    return stringBuilder.ToString();
}