Load a Datagridview with sub directoriesusing List<>

 private void LoadGridPrim( )
        {
            sMask = "*.*";
            string[] aExcludeExt = { ".db" };
            DirectoryInfo di = new DirectoryInfo(RootFolder);
            List<PolicyFolder> FolderRec = new List<PolicyFolder>();
            foreach (DirectoryInfo dir in di.GetDirectories())
            {
                PolicyFolder rcd = new PolicyFolder();
                rcd.Folder = dir.Name;
                FolderRec.Add(rcd);
            }
           
                var qryAll = FolderRec;
                dataGridView1.DataSource = qryAll;
           
 
 
            dataGridView1.RowHeadersVisible = false;
            string sTip = "Click on header to sort grid";
            ssiMethods.clsStaticMethods.SetupGrid(dataGridView1, Color.LightBlue, false);
            int i = 0;
            DataGridViewColumn column = dataGridView1.Columns[i];
            column.Visible = true;
            column.Width = 450;
            column.HeaderText = "Folder";
            column.HeaderCell.ToolTipText = sTip;
        }