// Controller
[Route("CreateUser")]
    public async Task<IHttpActionResult> PostCreateUser(SignUp parameters)
    {
        try
        {
                SignUpRepository repo = new SignUpRepository();
        var response = await repo.ResisterUser(parameters);
        }
        catch (Exception ex)
        {
            return Ok("Error occurred...." + ex.Message);
        }

    return Ok("SignUp successfully completed.");

}


// SignUpRepository Class
    public async Task<String> ResisterUser(SignUp signUp) {

        SignUpManager manager = new SignUpManager();
    var createUser = await CreateUserAsync(signUp, manager);

        if (String.IsNullOrWhiteSpace(createUser)) {
            return "No user created";
        }

    return "User successfully created.";
    }

    private Task<string> CreateUserAsync(SignUp signUp, SignUpManager manager)
    {
        return Task.Run<string>(() => CreateUserAccount(signUp, manager));
    }

    private string CreateUserAccount(SignUp signUp, SignUpManager manager)
    {
        Customer customer = new Customer {
            User_Name = signUp.UserName,
            Password = signUp.Password,
            First_Name = signUp.FirstName,
            Last_Name = signUp.LastName,
            Email_Address = signUp.Email,
            Mobile_Number = signUp.Mobile,
            Country_Id = signUp.CountryId
        };


        return manager.RegisterUser(customer);
    }

// SignUpManager Class
    public string RegisterUser(Customer customer)
    {
        return new SQLHelper().RegisterUser(customer);
    }

// SQL Helper Class
   public string RegisterUser(Customer customer)
    {
        using (SqlConnection conn = new SqlConnection("Connection String value"))
        {
            conn.Open();
            using (SqlCommand cmd = new SqlCommand())
            {
                cmd.Connection = conn;
                // cmd.CommandText = "sp_RegisterUserByThirdParty";
                cmd.CommandText = "sp_RegisterUserByLEOSmart";
                cmd.CommandType = CommandType.StoredProcedure;

                cmd.Parameters.Add(new SqlParameter("@UserName", customer.User_Name));
                cmd.Parameters.Add(new SqlParameter("@Password", customer.Password));
                cmd.Parameters.Add(new SqlParameter("@Full_Name", String.Format("{0} {1}", customer.First_Name, customer.Last_Name)));
                cmd.Parameters.Add(new SqlParameter("@Mobile_Number", customer.Mobile_Number));
                cmd.Parameters.Add(new SqlParameter("@Email", customer.Email_Address));
                cmd.Parameters.Add(new SqlParameter("@Country_ID", customer.Country_Id));

                cmd.Parameters.Add(new SqlParameter("@outToken", SqlDbType.VarChar, 16));
                cmd.Parameters["@outToken"].Direction = ParameterDirection.Output;

                cmd.ExecuteNonQuery();
                this.response = Convert.ToString(cmd.Parameters["@outToken"].Value);
            }
        }

        return this.response;
    }