private void editGroupToolStripMenuItem_Click(object sender, EventArgs e)
 {
     if (grouplist.SelectedItem != null)
     {
         //string oldname = grouplist.SelectedItem.ToString ();
         //grouplist.SelectedItem = oldname;
         int ind = grouplist.SelectedIndex;
         option_add_group lForm = new option_add_group();
         lForm.Owner     = this;//重要的一步,主要是使Form2的Owner指針指向Form1
         lForm.CMD       = "edit";
         lForm.groupName = grouplist.SelectedItem.ToString();
         lForm.ShowDialog();
         if (reGroup != null)
         {
             grouplist.Items[ind] = reGroup;
             reContact            = null;
         }
     }
 }
        //↓↓↓↓↓↓↓↓↓↓  group list right menu  ↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓↓
        private void addGroupToolStripMenuItem_Click(object sender, EventArgs e)
        {
            grouplist.Items.Add("new group");
            grouplist.SelectedItem = "new group";
            int ind = grouplist.SelectedIndex;

            option_add_group lForm = new option_add_group();

            lForm.Owner     = this;//重要的一步,主要是使Form2的Owner指針指向Form1
            lForm.CMD       = "add";
            lForm.groupName = "new group";
            lForm.ShowDialog();

            if (reGroup != null)
            {
                grouplist.Items[ind] = reGroup;
                reGroup = null;
            }
        }