Validate Input in ASP.NET MVC

[HttpPost]
[ValidateInput(false)]
public ActionResult  ValidateInput(string description)
{
   ValidateModel validateInputModel = new ValidateModel();
   validateInputModel.description = description;
   return View(validateInputModel);
}
來源：https://www.codeproject.com/Tips/753483/Validate-Input-in-ASP-NET-MVC