Hi everyone,

I am sorry if post this question in the wrong place.

I am using C#, Continuum to intercept user click buttons in Modal Dialog Window by the following code:

In Main:
Application GpApp;
Type t = Type.GetTypeFromProgID("Dynamics.Application", false);
GpApp = (Application)Activator.CreateInstance(t);
GpApp.RegisterFocusTrigger("window 'PM_Transaction_Entry' of form 'PM_Transaction_Entry", focusType, attachType, new ModalDialogHandler(), "action");

In ModalDialogHandler class:
class ModalDialogHandler
    {
        public void action(int dialog_type, string prompt, string control_1, string control_2, string control_3, int answer)
        {
            System.Console.WriteLine("Answer: " + answer.ToString());
        }
    }

I always get error "Specified cast is not valid." when I run this code.

Thank you in advance, I appreciate all you answers.

Tola 

Hi everyone,

Regarding to my problem, I have checked:

Register for COM interop  (in Project -> Properties -> Build )

It worked very well. But I still not understand why.

Anyone could explain me about this matter?

Tola