private void dt_student_SelectionChanged(object sender, EventArgs e)
{
if (dt_student.SelectedRows.Count > 0)
{
btnAdd_student.Visible = false;
DataGridViewRow row = dt_student.SelectedRows[0];
Student_User_Account = row.Cells[0].Value.ToString();
txtUser_name_student.Text = row.Cells[0].Value.ToString();
txtCMND_TCC_student.Text = row.Cells[5].Value.ToString();
txtFull_name_student.Text = row.Cells[4].Value.ToString();
txtMail_student.Text = row.Cells[8].Value.ToString();
txtSDT_student.Text = row.Cells[7].Value.ToString();
dtStudent_Picker.Value = DateTime.Parse(row.Cells[6].Value.ToString());
Class_CBB.Text = BUS_Admin.findClassByID(row.Cells[3].Value.ToString());
}
}
