Recursive function through controls

        /// 

        /// Recursive loop through form controls.
        /// 
        private void SetFormDisabled (Control control)
        {
            foreach (Control ctrl in control.Controls)
            {
                if (ctrl is TextBox) 
                {
                    ((TextBox)(ctrl)).Enabled = false;
                }
                else if (ctrl is Telerik.WebControls.RadNumericTextBox)
                {
                    ((Telerik.WebControls.RadNumericTextBox)(ctrl)).Enabled = false;
                }
                else if (ctrl is CheckBox)
                {
                    ((CheckBox)(ctrl)).Enabled = false;
                }
                else
                {
                    if (ctrl.Controls.Count > 0)
                    {
                        SetFormDisabled (ctrl);
                    }
                }
            }
        }