private void bttnAdd_Click(object sender, EventArgs e)
{
db = new StudentEntities();
switch (textBoxClass.Text)
{
case "1":
idClass = 1;
saveData();
break;
case "2":
idClass = 2;
saveData();
break;
case "3":
idClass = 3;
saveData();
break;
case "4":
idClass = 4;
saveData();
break;
default:
MessageBox.Show("Khai báo sai lớp!", "LỖI", MessageBoxButtons.OK, MessageBoxIcon.Error);
break;
}
}
void loadData()
{
db = new StudentEntities();
var result = from c in db.sinhviens
select new { id = c.ID, Name = c.student, Class = c.Lop.@class };
dataGridView1.DataSource = result.ToList();
}
