web api response plain text formatter

1)Nuget to install WebAPIContrib text formatter, 

initialized it in the Application_Start/WebApiConfig.cs

at end add below line:

  config.Formatters.Add(new PlainTextFormatter());

2) In the controller add "text/plain" parameter.

 public HttpResponseMessage GetPlainText()

{
  return ControllerContext.Request.CreateResponse(HttpStatusCode.OK, "Test data", "text/plain");
}