清空界面上所有Text控件

        protected virtual void ClearText()
        {
            foreach (Control ctl in Page.Controls[1].Controls)
            {
                if (ctl is System.Web.UI.WebControls.TextBox)
                {
                    System.Web.UI.WebControls.TextBox tempCtl;
                    tempCtl = (System.Web.UI.WebControls.TextBox)ctl;
                    tempCtl.Text = "";
                }
            }
        }