private void frmAddGroup_Load(object sender, EventArgs e)
 {
     if (ID != null)
     {
         obj = db.pqForms.Single(p => p.ID == ID);
         txtNameGroup.Text = obj.FormName;
         txtDienGiai.Text  = obj.DienGiai;
     }
 }
 public frmAddForm()
 {
     InitializeComponent();
     db  = new DatabaseDataContext();
     obj = new pqForm();
 }