Thank you this info is very helpful.  It all of a sudden clicked and this matter is resolved.

Thanks for taking the time to respond.

The samples work fine, I guess i am doing it wrong.  Although its strange that it works for all single day appointments  but not mufti day appointments?

Do I need to use the Variance and resource Datasources?  What are they?

I was just doing something quickly to show appointments for a day and when I use the following code for an appointment that goes from 1 day to another it doesn't show on the date it started.

AppointmentsDT = new DataTable("Appointments");
 
        AppointmentsDT.Columns.Add("ID", typeof(int));
        AppointmentsDT.Columns.Add("StartDateTimeUtc", typeof(DateTime));
        AppointmentsDT.Columns.Add("Duration", typeof(int));
        AppointmentsDT.Columns.Add("Subject", typeof(string));
        AppointmentsDT.Columns.Add("AllDayEvent", typeof(bool));
        AppointmentsDT.Columns.Add("Location", typeof(string));
        AppointmentsDT.Columns.Add("ActivityDescription", typeof(string));
        AppointmentsDT.Columns.Add("Status", typeof(int));
        AppointmentsDT.Columns.Add("EnableReminders", typeof(bool));
        AppointmentsDT.Columns.Add("ShowTimeAs", typeof(int));
        AppointmentsDT.Columns.Add("Importance", typeof(int));
        AppointmentsDT.Columns.Add("VarianceID", typeof(string));
        AppointmentsDT.Columns.Add("RecurrencePattern", typeof(string));
        AppointmentsDT.Columns.Add("RecurrenceID", typeof(int));
        AppointmentsDT.Columns.Add("OriginalStartDateTimeUtc", typeof(DateTime));
        AppointmentsDT.Columns.Add("ResourceKey", typeof(string));

         
        AppointmentsDT.Rows.Add(new object[] { 1,'today at 9pm', 'a timespan that goes into the next day', 'whatever', false, "", "", 1, false, 1, 1, Guid.NewGuid().ToString(), "", null, null, "-999" });
        WebScheduleGenericDataProvider1.ActivityDataSource = AppointmentsDT;

I guess I didn't read thru everything before I started using the webschedule.  There is so many different places to get help its kind of overwhelming at first(the sample son teh website dont explain anything). Some of the documentation seems to read like a computer wrote it and I find it hard to learn about the different concepts with each control from the beginning.  But anyway can you recommend a starting place that describes how the scheduleinfo should be used with the different schedule controls and what the activity, variance and resource stuff is?