Face Null Value from Model

Question

This is my code I have face a Issue null value 

 

public class NotificationMenuViewComponent : ViewComponent

{

public IViewComponentResult Invoke(NotificationMenuDataModel notificationMenuDataModel)

{

var vm = new Notification();--Here Null Value Render but i have set value in input box.

if (vm.Title != null)

{

try

{

vm.Title = notificationMenuDataModel.Title;

vm.Message = notificationMenuDataModel.Message;

}

catch (Exception ex)

{

}

}