用递归实现的改变页面控件状态

环境:Net2.0
调用时直接Utility.ChangeChildEditMode(this.Form, false);

public static void ChangeChildEditMode(Control con, bool blnEditMode)
    {
        int i = 0;
        foreach (Control c in con.Controls)
        {

            if (c is TextBox)
            {
                ((TextBox)c).Enabled = blnEditMode;
            }
            else if (c is Button)
            {
                ((Button)c).Enabled = blnEditMode;
            }
            else if (c is DropDownList)
            {
                ((DropDownList)c).Enabled = blnEditMode;
            }
            else if (c is ListBox)
            {
                ((ListBox)c).Enabled = blnEditMode;
            }
            else if (c is CheckBox)
            {
                ((CheckBox)c).Enabled = blnEditMode;
            }
            else if (c is CheckBoxList)
            {
                ((CheckBoxList)c).Enabled = blnEditMode;
            }
            else if (c is RadioButton)
            {
                ((RadioButton)c).Enabled = blnEditMode;
            }
            else if (c is RadioButtonList)
            {
                ((RadioButtonList)c).Enabled = blnEditMode;
            }
            else if (c is HyperLink)
            {
                ((HyperLink)c).Enabled = blnEditMode;
            }
            else if (c.HasControls())
            {
                ChangeChildEditMode(c, blnEditMode);
                i++;
            }
        }
    }