C# Form Readonly

    public void LockControlValues(System.Windows.Forms.Control Container)
    {
        try
        {
            foreach (Control ctrl in Container.Controls)
            {
                if (ctrl.GetType() == typeof(TextBox))
                    ((TextBox)ctrl).ReadOnly = true;
                if (ctrl.GetType() == typeof(ComboBox))
                    ((ComboBox)ctrl).Enabled= false;
                if (ctrl.GetType() == typeof(CheckBox))
                    ((CheckBox)ctrl).Enabled = false;

                if (ctrl.GetType() == typeof(DateTimePicker))
                    ((DateTimePicker)ctrl).Enabled = false;

                if (ctrl.Controls.Count > 0)
                    LockControlValues(ctrl);
            }
        }
        catch (Exception ex)
        {
            MessageBox.Show(ex.ToString());
        }
    }