private void SetTextReadOnly(Control ctr, bool blReadOnly)

        {

            ctr.Controls.Cast<Control>().Select(s => s).ToList<Control>().ForEach(s =>

                {

                    if (s.GetType() == typeof(TextBox))

                        ((TextBox)s).ReadOnly = blReadOnly;

                    if (s.HasChildren)

                    {

                        SetTextReadOnly(s, blReadOnly);

                    }

                });

            //foreach (Control c in ctr.Controls)

            //{

            //    if (c.GetType() == typeof(TextBox))

            //    {

            //        ((TextBox)c).ReadOnly = true;

            //    }

            //    if (c.HasChildren)

            //    {

            //        SetTextReadOnly(c, blReadOnly);

            //    }

            //}

        }