//code voor de toevoegknop van een nieuwe activiteit in de activiteitenlijst
private void Btntoevoegen_Click(object sender, EventArgs e)
{
Activity_Service activityService = new Activity_Service();
AddCalendar.MaxSelectionCount = 1;
string AddedDescription = Txtaddomschrijving.Text;
DateTime AddedStartTime = AddCalendar.SelectionRange.Start;
int AddedNumberofStudents = int.Parse(Txtaddstudentenaantal.Text);
int AddedNumberofLecturers = int.Parse(Txtadddocentenaantal.Text);
if (AddedDescription != "" && AddedStartTime != null && AddedNumberofStudents != 0 && AddedNumberofLecturers != 0)
{
activityService.AddNewActivity(AddedDescription, AddedStartTime, AddedNumberofStudents, AddedNumberofLecturers);
}
ShowPanel("Activities");
}
