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(); }