public HttpResponseMessage Get() { try { var value = ManageDB.GetCO2LastValue(); var valueInt = Convert.ToInt32(value); int valueInPercent; if (value < 350) { valueInPercent = 0; } else if (value > 1000) { valueInPercent = 100; } else { valueInPercent = Convert.ToInt32((value / 100) * 6.5); } //var valueInPercent = / 70); return(Request.CreateResponse(HttpStatusCode.OK, valueInPercent)); } catch { return(Request.CreateResponse(HttpStatusCode.BadRequest)); } }