private void TextBoxSearch_KeyDown(object sender, KeyEventArgs e)    // Sự kiện ấn nút enter => login
 {
     if (e.KeyCode == Keys.Enter)
     {
         BtSearch.PerformClick();
     }
 }
 private void TBSearch_KeyDown(object sender, KeyEventArgs e)
 {
     if (e.KeyCode == Keys.Enter)
     {
         e.Handled = e.SuppressKeyPress = true;
         BtSearch.PerformClick();
     }
 }