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Your constants CKEY1 and CKEY2 and argument Key have int type. So expression

In order to bind, the input names much follow a particular convention that maps to what you're binding to. While it's unclear from your question, my best guess is that you're trying to ultimately bind to an instance of EmployeeViewModel, which means that your contact information inputs would need names like: EmployeeContact[0].Telephone, but when you pass an instance of ContactDetailViewModel along as the "model" of the partial view, the names will be just Telephone, and worse, these same names will be repeated over and over, i.e. each contact information set of fields you create will all have an input named just Telephone.

Long and short, you need the context of the whole model to generate the correct input names. You have a couple of options.

Since you're retrieving the set of fields via an AJAX request, it would be possible to pass the "prefix" to use along with that request. In other words, you can keep track of an index value, counting how many of these sections you've added, and then send along with the request for a new section something like

you can do like this for bind model for normal html syntax its just example you need modified according to your need

Your code needs to be recompiled so that the compiler can generate a call to a new method that takes three arguments. Optional methods are just syntactic sugars, when you don't provide an optional argument the compiler passes the default value for you. But it can't happen if you don't recompile your code and you will attempt to call method with two arguments while three was expected.

I can't replicate or test, but hopefully this gets you started.

This solution replaces _messages, _messageObserver and _messageObservable with a subject and a Reactive Query. A couple notes:

• ObserveOn allows you to shift threads by changing 'schedulers'. I selected the TaskPoolScheduler which will execute the rest of the query on a different Task.
• I would recommend calling the syncronous version of _queueClient.SendAsync since this example allows Rx to handle the threading.
• This solution uses Rx exception handling which will terminate the observable/handling in case of an exception. If you want it to restart automatically, then add a .Catch/.Retry.

Code:

No, Exceptions in this code do not tear the Application Pool down. I cannot reproduce the problem locally and it still break on the production server. I've deliberately added a throw Exception to the suspect code but the Application is not torn down at any time. I'm giving it a rest for now.

Based on the model used in the view,

Trying to reproduce your problem, I have created the following filter and your code works for me (OnActionExecuted, OnActionExecuting is called):

The valueJSON is a JToken, Json(valueJSON) method is serializing your valueJson as a JToken class and not as the deserialized array of objects that you need, you can try to return the JToken as a string with return Content(valueJSON .ToString(),"application/json"); or parse the JToken to the original array of objects.