//--- display choosen course information
private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
{
try
{
Instructors.Items.Clear();
int crsId = (int)comboBox1.SelectedItem;
Online_Exame ent = new Online_Exame();
var item = (from d in ent.courses
where d.C_id == crsId
select d).First();
textBox1.Text = item.C_name;
//get instructors of the course
var items = ent.get_course_instructors(crsId);
foreach (var i in items)
{
Instructors.Items.Add(i);
}
}
catch (InvalidOperationException)
{
Instructors.Items.Add("No instructor");
}
}