public ActionResult CreateCategoryAjax(string categoryName) { if (string.IsNullOrEmpty(categoryName)) { ToastrService.AddToUserQueue("Category can not be empty.", "Requred !", ToastrType.Error); } else { db.Categories.Add(new Category { Name = categoryName }); db.SaveChanges(); ToastrService.AddToUserQueue("Category added.", "Success", ToastrType.Success); } string js = ToastrService.ToJavascript(ToastrService.ReadAndRemoveUserQueue()); // <script></script> gerek yok.. return(JavaScript(js)); }