public JsonResult <String> Post([FromBody] FormDataCollection _klantVars) { String succesMessage = "Insert gelukt"; String strInsertM = ""; String naam = _klantVars.GetValues("naam")[0]; String pwd = _klantVars.GetValues("pwd")[0]; String email = _klantVars.GetValues("email")[0]; // Check if values are empty... if (locUtil.isEmpty(naam) && locUtil.isEmpty(pwd) && locUtil.isEmpty(email)) { return(Json("[{ \"message\" :\" " + "empty values" + "\"}]")); } try { strInsertM = this.klantDao.insert(new Klant( 0, naam, pwd, email ), succesMessage ); } catch (NullReferenceException ee) { return(Json("{" + ee.ToString() + "}")); } return(Json("[{ \"message\" :\" " + strInsertM + "\"}]")); // Empty Json }