How to send two object as response message and response code in web api

Question

I want to send response message like this

{"message_code": 00, "message": "Success"}

My Response Message Class

 public class ResponseMessage
 {
    public string MessageCode { get; set; }
    public string Message { get; set; }
 }

And my Message Method

public ResponseMessage Message(FundTransfer transfer)
{
    var checkBalance = 
    BusinessLayer.Api.AccountHolderApi.GetBalance(transfer.FromAccount);

    if (checkBalance.Balance.ToDecimal() < transfer.Amount)
    {
        return new ResponseMessage
        {
            MessageCode = "22",
            Message = "Insufficient Balance"
        };
    }
    else
    {
        var transferData = BusinessLayer.Api.AccountHolderApi
            .FundTransfer(transfer);

        if (transferData == true)
        {
            return new ResponseMessage { MessageCode = "00", Message = "Success" };
        }
        else
        {
            return new ResponseMessage { MessageCode = "11", Message = "Some Error" };
        }
    }  
}

And my API Method

[HttpPost]
[ActionName("transfer")]
public IHttpActionResult FundTransfer([FromBody] FundTransfer transfer)
{
    var response = Message(transfer);
    if (response.MessageCode == "11")
    {
        return Content(HttpStatusCode.BadRequest, response.Message);
    }
    else
    {
        return Ok(response.Message);
    }
}

Now for example when the transferData == true in my Message() Method I get only message object value as "Success" since in my return content I am returning the response.Message . I want to get the response in JSON as

{"message_code": 00, "message": "Success"}

instead of just "success"

Currently learning Web API.

Answer 1

Refactor API Method to return model instead of just the message property

[HttpPost]
[ActionName("transfer")]
public IHttpActionResult FundTransfer([FromBody] FundTransfer transfer) {
    var response = Message(transfer);
    if (response.MessageCode == "11") {
        return Content(HttpStatusCode.BadRequest, response);
    } else {
        return Ok(response);
    }
}

Also to get message like this

{"message_code": "00", "message": "Success"}

Refactor ResponseMessage class via JSON property attribute...

 public class ResponseMessage {
    [JsonProperty("message_code")]
    public string MessageCode { get; set; }
    [JsonProperty("message")]
    public string Message { get; set; }
 }

Or construct model anonymously

[HttpPost]
[ActionName("transfer")]
public IHttpActionResult FundTransfer([FromBody] FundTransfer transfer) {
    var response = Message(transfer);
    var model = new {
        message_code = response.MessageCode,
        message = response.Message
    };
    if (response.MessageCode == "11") {
        return Content(HttpStatusCode.BadRequest, model);
    } else {
        return Ok(model);
    }
}