attribute ValidateInput(false) not work in IAuthorizationFilter

When I edit my username as html tag or xml tag it will generate exception like:

`potentially dangerous Request.Form` in `filterContext.HttpContext.Request.Params["key"];` 

But i have mension `[ValidateInput(false)]` why it's not handled in  `MyFilter` class.


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Following is my code:


**FilterConfig.cs**:

	public class FilterConfig
    {
        public static void RegisterGlobalFilters(GlobalFilterCollection filters)
        {
            filters.Add(new MyFilter()); 
            
        }
    }

**MyFilter.cs**:

	public class MyFilter: IAuthorizationFilter
	{
		public void OnActionExecuted(ActionExecutedContext filterContext)
        {
            SessionDataManagement.BackupCurrent();
        }
		
		public void OnAuthorization(AuthorizationContext filterContext)
        {
			string requestID = filterContext.HttpContext.Request.Params["key"];
		}
	}

**MyController.cs**:

	public class CompanyController : BaseController
    {
		[HttpPost]
        [ValidateAntiForgeryToken]
        [ValidateInput(false)]
        public ActionResult Edit(Class1 objCompany)
        {
			//Logic
		}
	}

**Class1.cs**:

	public class Class1
    { 
        [Required]
        [AllowHtml]
        [StringLength(200)]
        public string UserName { get; set; }
		
	}