private void Button_Click_5(object sender, RoutedEventArgs e)
        {
            studentGrid.Visibility   = Visibility.Hidden;
            groupdatagrid.Visibility = Visibility.Hidden;
            hiddenips();
            hideaddmember();
            grouplist.Items.Clear();
            if (grpname != null)
            {
                grpname.Clear();
                grppath.Clear();
            }
            readGroupFile objread = new readGroupFile();

            objread.read(ref grpname, ref grppath);
            foreach (string item in grpname)
            {
                grouplist.Items.Add(item);
            }

            groupbuttonshow();
        }
        private void Button_Click_5(object sender, RoutedEventArgs e)
        {
            studentGrid.Visibility = Visibility.Hidden;
            groupdatagrid.Visibility = Visibility.Hidden;
            hiddenips();
            hideaddmember();
            grouplist.Items.Clear();
            if (grpname != null)
            {
                grpname.Clear();
                grppath.Clear();
            }
            readGroupFile objread = new readGroupFile();
            objread.read(ref grpname,ref grppath);
            foreach (string item in grpname)
            {
                grouplist.Items.Add(item);
            }

            groupbuttonshow();
        }