generate response HTTPResponseMessage to the given format

want to get the response of web api method as given below. Trying to use HttpResponseMessage but its not generating properly in a json format .

{ "Version": { "_Major": 1, "_Minor": 1, "_Build": -1, "_Revision": -1 }, "Content": { "Headers": [ { "Key": "Content-Type", "Value": [ "text/plain; charset=utf-8" ] } ] }, "StatusCode": 400, "ReasonPhrase": "", "Headers": [], "RequestMessage": null, "IsSuccessStatusCode": false }