Error Message: does not contain a constructor that takes 1 arguments

I am trying to send an an Exchange Calendar Event from c#. When I call it from Page_Load it works great. However when I call it from an on_click function I get an error saying "does not contain a constructor that takes 1 arguments." Why is that?

        protected void Page_Load(object sender, EventArgs e)
        {
            ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
            service.Credentials = new WebCredentials("Email", "Password");
            service.AutodiscoverUrl("Email", RedirectionUrlValidationCallback);
            Appointment meeting = new Appointment(service);
            meeting.Subject = "Team Building Exercise";
            meeting.Body = "Everyone is invited";
            meeting.Start = DateTime.Now.AddDays(5);
            meeting.End = meeting.Start.AddHours(4);
            meeting.StartTimeZone = TimeZoneInfo.Local;
            meeting.EndTimeZone = TimeZoneInfo.Local;
	    meeting.RequiredAttendees.Add("Mack@contoso.com");
            meeting.RequiredAttendees.Add("Sadie@contoso.com");
            meeting.OptionalAttendees.Add("Magdalena@contoso.com");
            meeting.ReminderMinutesBeforeStart = 60;
            meeting.Save(SendInvitationsMode.SendToAllAndSaveCopy);
            Item item = Item.Bind(service, meeting.Id, new PropertySet(ItemSchema.Subject));
            label1.Text = item.Id + "has been scheduled"; 
        }

	protected void EnterAppointment_Click(object sender, EventArgs e)
        {
            ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013_SP1);
            service.Credentials = new WebCredentials("Email", "Password");
            service.AutodiscoverUrl("Email", RedirectionUrlValidationCallback);
            Appointment meeting = new Appointment(service);
            meeting.Subject = "Team Building Exercise";
            meeting.Body = "Everyone is invited";
            meeting.Start = DateTime.Now.AddDays(5);
            meeting.End = meeting.Start.AddHours(4);
            meeting.StartTimeZone = TimeZoneInfo.Local;
            meeting.EndTimeZone = TimeZoneInfo.Local;
	    meeting.RequiredAttendees.Add("Mack@contoso.com");
            meeting.RequiredAttendees.Add("Sadie@contoso.com");
            meeting.OptionalAttendees.Add("Magdalena@contoso.com");
            meeting.ReminderMinutesBeforeStart = 60;
            meeting.Save(SendInvitationsMode.SendToAllAndSaveCopy);
            Item item = Item.Bind(service, meeting.Id, new PropertySet(ItemSchema.Subject));
            label1.Text = item.Id + "has been scheduled"; 
	}

        private static bool RedirectionUrlValidationCallback(string redirectionUrl)
        {
            bool result = false;

            Uri redirectionUri = new Uri(redirectionUrl);

            // Validate the contents of the redirection URL. In this simple validation
            // callback, the redirection URL is considered valid if it is using HTTPS
            // to encrypt the authentication credentials. 
            if (redirectionUri.Scheme == "https")
            {
                result = true;
            }
            return result;
        }

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RecipeDanAsked:
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Miguel OzSoftware EngineerCommented:
Is this the faulty line?
ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2013_SP1);

If so please change it to:
ExchangeService service = new ExchangeService();

No need to specify version when you are targeting the latest one.
0
RecipeDanAuthor Commented:
No it is this line that is showing the error:

Appointment meeting = new Appointment(service);
0
RecipeDanAuthor Commented:
I tried your suggestion and still get the same error message
0
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Miguel OzSoftware EngineerCommented:
That is very odd - the code looks right.
Q1. Did you remove the page load code before running the click event handler?
Q2. Have you had a breakpoint in the faulty line to check that service is initialized correctly?
Q3. What VS/ASP.NET MVC version are you using?

Note: You could try to declare service as private variable of your page and remove the constructor line, thus the service variable will be available for the lifetime of the page not just the click event handler.
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RecipeDanAuthor Commented:
Q1: Yes I did
Q2: Yes it is being initialized
Q3: I am using web forms

I did try it as a private variable before I posted the question. Same result.
0
ChloesDadCommented:
Have you put a breakpoint in the page_Load routine to verify that Page_Load is actually being executed?
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RecipeDanAuthor Commented:
The Page_Load works fine. It is when I put the routine in an on_click function the error message pops up
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ChloesDadCommented:
The only reason that this can happen is if the on_click event is seeing another class called Appointment that does not take a parameter in its constructor.

What happens if you enter the full namespace of the appointment class.

Microsoft.Exchange.WebServices.Data.Appointment
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RecipeDanAuthor Commented:
Yes that was the case. The page name is appointment.aspx. So I renamed the page and it works fine. Thank you for your assistance.
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