c# function to mask and display password string as *

MaskPassword.cs

        /// <summary>
        /// Function to display password string as *, return appropriate one to the code.
        /// </summary>
        public static string ReadLineMasked(char mask = '*')
        {
            var sb = new StringBuilder();
            ConsoleKeyInfo keyInfo;
            while ((keyInfo = Console.ReadKey(true)).Key != ConsoleKey.Enter)
            {
                if (!char.IsControl(keyInfo.KeyChar))
                {
                    sb.Append(keyInfo.KeyChar);
                    Console.Write(mask);
                }
                else if (keyInfo.Key == ConsoleKey.Backspace && sb.Length > 0)
                {
                    sb.Remove(sb.Length - 1, 1);

                    if (Console.CursorLeft == 0)
                    {
                        Console.SetCursorPosition(Console.BufferWidth - 1, Console.CursorTop - 1);
                        Console.Write(' ');
                        Console.SetCursorPosition(Console.BufferWidth - 1, Console.CursorTop - 1);
                    }
                    else Console.Write("\b \b");
                }
            }
            Console.WriteLine();
            return sb.ToString();
        }