OnBeforeAppointmentRemoved Method

Raises the BeforeAppointmentRemoved event before an Appointment is removed from the Appointments collection.

Syntax

Visual Basic

'Declaration
 
Protected Overridable Sub OnBeforeAppointmentRemoved( _
   ByVal e As CancelableAppointmentEventArgs _
) 

C#

protected virtual void OnBeforeAppointmentRemoved( 
   CancelableAppointmentEventArgs e
)

Parameters

e

A CancelableAppointmentEventArgs that provides data for the event.

Remarks

Raising an event invokes the event handler through a delegate.

The OnBeforeAppointmentRemoved method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.

Notes to Inheritors: When overriding OnBeforeAppointmentRemoved in a derived class, be sure to call the base class's OnBeforeAppointmentRemoved method so that registered delegates receive the event.

Example

This example uses the CancelableAppointmentEventArgs' Cancel property to disallow the removal of Appointments that span more than one day.

For an overview of how to handle events in Visual Basic or Visual C#, see Event Handlers in Visual Basic and Visual C#. For specific information and code examples illustrating how to consume events in your application, see Consuming Events in the .NET Framework Developer's Guide.

Visual Basic

Imports Infragistics.Shared
Imports Infragistics.Win
Imports Infragistics.Win.UltraWinSchedule
Imports System.Diagnostics

    Private Sub ultraCalendarInfo1_BeforeAppointmentRemoved(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinSchedule.CancelableAppointmentEventArgs) Handles ultraCalendarInfo1.BeforeAppointmentRemoved

        '----------------------------------------------------------------------------------------------------
        '	Description
        '	BeforeAppointmentRemoved
        '
        '	Fires before an appointment is removed from the component's Appointments collection.
        '	If canceled, the Appointment is not removed, and the AfterAppointmentRemoved event does not fire.
        '
        '----------------------------------------------------------------------------------------------------

        '	Get the Appointment's starting and ending dates, and
        '	determine whether it spans more than one day
        Dim startDate As DateTime = e.Appointment.StartDateTime.Date
        Dim endDate As DateTime = e.Appointment.StartDateTime.Date

        If (endDate > startDate) Then
            '	To prevent the removal of the Appointment, set the Cancel
            '	property to true
            e.Cancel = True

            '	Let the end user know what happened
            Dim info As String = String.Empty
            info += "You do not have sufficient permissions to remove multi-day appointments." + vbCrLf

            MessageBox.Show(info, "BeforeAppointmentRemoved", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End If

    End Sub

C#

using System.Diagnostics;
using Infragistics.Shared;
using Infragistics.Win;
using Infragistics.Win.UltraWinSchedule;

		private void ultraCalendarInfo1_BeforeAppointmentRemoved(object sender, Infragistics.Win.UltraWinSchedule.CancelableAppointmentEventArgs e)
		{

			//----------------------------------------------------------------------------------------------------
			//	Description
			//	BeforeAppointmentRemoved
			//
			//	Fires before an appointment is removed from the component's Appointments collection.
			//	If canceled, the Appointment is not removed, and the AfterAppointmentRemoved event does not fire.
			//
			//----------------------------------------------------------------------------------------------------
		
			//	Get the Appointment's starting and ending dates, and
			//	determine whether it spans more than one day
			DateTime startDate = e.Appointment.StartDateTime.Date;
			DateTime endDate = e.Appointment.StartDateTime.Date;

			if ( endDate > startDate )
			{
				//	To prevent the removal of the Appointment, set the Cancel
				//	property to true
				e.Cancel = true;

				//	Let the end user know what happened
				string info = string.Empty;
				info += "You do not have sufficient permissions to remove multi-day appointments." + "\n";

				MessageBox.Show( info, "BeforeAppointmentRemoved", MessageBoxButtons.OK, MessageBoxIcon.Error );
			}

		}

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2