Visual Studio 2013 Outlook Add-In

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C#

Outlook

AddIn

I've created a outlook addin to send some changes to my team control module mssql server database whenever i change the status of an outlook task. but the problem is that the change event only fires 2 times. after that i need to close and open outlook again to remain working. I think the problem is that i've created my delegate event on addin startup event. Here is a sample of my codes:

//Event declaration
private void ThisAddIn_Startup(object sender, System.EventArgs e)
{
   Application.Session.GetDefaultFolder(Outlook.OlDefaultFolders.olFolderTasks).Items.ItemChange += new Outlook.ItemsEvents_ItemChangeEventHandler(TaskEvent_PropertyChange);
   ...
}

//Event Code
void TaskEvent_PropertyChange(object ChangedObject)
{
    ....
}