Meeting Notice Being Sent Even Though I Have Set Cancel in Item_Write - outlook

Question

I'm setting the Cancel check in the Item_Write event handler for a meeting request because if I set the Cancel to true in Item_Send, the meeting window closes. What I'm trying to do is prompt the user that they have recipients that would normally get processed using a custom button in the ribbon (button details not important for my question). Anyway, when I try to Cancel the Item_Write event a meeting notice is sent regardless. No matter what I try, I cannot stop the meeting notice from going out even though I'm setting the ref Cancel to true. If I cancel on Item_Send then the window closes, which is not what the users want. The only thing I can think of at this point is perhaps the requestDetailsRegion.SaveRequestDetailsToLocalOutlookItemProperties(), which saves custom form region field properties to defined custom properties on the AppointmentItem, is triggering the Application_Item_Load event and this somehow is prompting Outlook to send the meeting invite notice, as if it's pending. I'm running this in Outlook 2010. Thank you in advance.
Here's some example code:
void Item_Write(ref bool Cancel)
{
Cancel = CancelInvite(Cancel);
}
private bool CancelInvite(bool Cancel)
{
Inspector activeInspector = Globals.ThisAddIn.Application.ActiveInspector();
WindowFormRegionCollection formRegions = Globals.FormRegions[activeInspector];
RequestDetailsFormRegion requestDetailsRegion = formRegions.RequestDetailsForm;
// Add request form details to meeting item.
requestDetailsRegion.SaveRequestDetailsToLocalOutlookItemProperties();
// Checking if there's an incomplete form request pending submission
if (requestDetailsRegion.txtFileName_Hidden.TextLength == 0 &&
appointmentItem != null && appointmentItem.MeetingStatus != OlMeetingStatus.olMeetingCanceled)
{
Persons meetingRecipients = new Persons();
foreach (Outlook.Recipient recipient in appointmentItem.Recipients)
if (recipient.Address != activeInspector.Session.CurrentUser.Address)
meetingRecipients.Add(new MeetingRecipient(recipient));
if (meetingRecipients.ContainsSpecialRecipients)
{
CustomDialog customDialog = new CustomDialog();
customDialog.OkButtonText = messageBoxTextStatusOK;
customDialog.CancelButtonText = messageBoxTextStatusCancel;
DialogResult dialogResult = customDialog.ShowDialog();
if (dialogResult == DialogResult.Cancel)
{
Cancel = true;
}
else
{
Cancel = false;
}
customDialog.Close();
}
}
return Cancel;
}
public void SaveRequestDetailsToLocalOutlookItemProperties()
{
if (this.OutlookItem is Outlook.AppointmentItem)
{
Outlook.AppointmentItem appointmentItem = (Outlook.AppointmentItem)this.OutlookItem;
// Checking if organizer already cancelled meeting. If so, then no need to update apppointment item properties.
if (appointmentItem.MeetingStatus != Outlook.OlMeetingStatus.olMeetingCanceled)
{
appointmentItem.ItemProperties[RequestSubmitted].Value = chkSubmitted.Checked; // Hidden
appointmentItem.ItemProperties[Filename].Value = txtFileName_Hidden.Text; // Hidden
appointmentItem.ItemProperties[ReasonForVisit].Value = txtReason.Text;
// SPARING SIMILAR LINES OF CODE
...
chkSaved.Checked = true;
}
}

Answer 1

You never set the (ref) Cancel parameter to true
void Item_Write(ref bool Cancel)
{
this.cancelInviteResult = CancelInvite(Cancel);
Cancel = this.cancelInviteResult;
}