static string GenerateCode()
        {
            StringBuilder code = new StringBuilder();
            string RANDOMLETTERS = "qwertyuiopasdfghjklzxcvbnm";
            string RANDOMLETTERSandnumbers = "qwertyuiopasdfghjklzxcvbnm123456789";
            code.Append(1);
            code.Append(random.Next(100, 999));
            code.Append(RANDOMLETTERS[random.Next(0, RANDOMLETTERS.Length)]);
            code.Append(RANDOMLETTERS[random.Next(0, RANDOMLETTERS.Length)]);
            code.Append(0);
            code.Append(random.Next(0, 9));
            code.Append(RANDOMLETTERSandnumbers[random.Next(0, RANDOMLETTERSandnumbers.Length)]);
            code.Append(RANDOMLETTERSandnumbers[random.Next(0, RANDOMLETTERSandnumbers.Length)]);
            code.Append(RANDOMLETTERSandnumbers[random.Next(0, RANDOMLETTERSandnumbers.Length)]);
            code.Append(8);
            return code.ToString();
        }