private void btnSupliment_Click(object sender, EventArgs e)
{
frmSupliment f2 = new frmSupliment();
f2.crsId = CourseId;
f2.Show();
}
public void FillCombobox()
{
frmSupliment sp = new frmSupliment();
using (AppContext db = new AppContext())
{
var courseName = db.Courses.Select(x => x.CourseName).ToList();
foreach (var item in courseName)
{
cmbBox.Items.Add(item);
}
}
}