Navish Jain MS Dynamics CRM Consultant

In this article , I am going to explain how to Book and Validate appointment

Get the current user information
WhoAmIRequest userRequest = new WhoAmIRequest();
WhoAmIResponse userResponse = (WhoAmIResponse)_serviceProxy.Execute(userRequest);


Create the ActivityParty instance
ActivityParty party = new ActivityParty
{
    PartyId = new EntityReference(SystemUser.EntityLogicalName, userResponse.UserId)
};


Create the appointment instance
Appointment appointment = new Appointment
{
    Subject = " Appointment 1",
    Description = "Appointment to Book.",
    ScheduledStart = DateTime.Now.AddHours(1),
    ScheduledEnd = DateTime.Now.AddHours(2),
    Location = "Office",
    RequiredAttendees = new ActivityParty[] { party },
    Organizer = new ActivityParty[] { party }
};


Book Request message
BookRequest book = new BookRequest
{
    Target = appointment
};
BookResponse booked = (BookResponse)_serviceProxy.Execute(book);
Guid _appointmentId = booked.ValidationResult.ActivityId;


Complete Code
using (OrganizationServiceProxy _serviceProxy = new OrganizationServiceProxy(serverConfig.OrganizationUri,
                                                    serverConfig.HomeRealmUri,
                                                    serverConfig.Credentials,
                                                    serverConfig.DeviceCredentials))
{
    _serviceProxy.ServiceConfiguration.CurrentServiceEndpoint.Behaviors.Add(new ProxyTypesBehavior());


    // Get the current user information
    WhoAmIRequest userRequest = new WhoAmIRequest();
    WhoAmIResponse userResponse = (WhoAmIResponse)_serviceProxy.Execute(userRequest);

    // Create the ActivityParty instance.
    ActivityParty party = new ActivityParty
    {
        PartyId = new EntityReference(SystemUser.EntityLogicalName, userResponse.UserId)
    };


    // Create the appointment instance.
    Appointment appointment = new Appointment
    {
        Subject = " Appointment 1",
        Description = "Appointment to Book.",
        ScheduledStart = DateTime.Now.AddHours(1),
        ScheduledEnd = DateTime.Now.AddHours(2),
        Location = "Office",
        RequiredAttendees = new ActivityParty[] { party },
        Organizer = new ActivityParty[] { party }
    };



    // Use the Book request message.
    BookRequest book = new BookRequest
    {
        Target = appointment
    };
    BookResponse booked = (BookResponse)_serviceProxy.Execute(book);
    Guid _appointmentId = booked.ValidationResult.ActivityId;

}