public override string GetDesignTimeHtml()
        {
            vTB = (validateTextBox)Component;
            StringWriter   sw     = new StringWriter();
            HtmlTextWriter writer = new HtmlTextWriter(sw);

            vTB.RenderControl(writer);

            string myStr = @"<span style=""width:10px; height:20px;color:#ff0000;font-size:18px; line-height:18px;margin-right:-5px;margin-left:5px;"">V</span>";

            return(vTB.Check ? myStr + sw.ToString() : sw.ToString());
        }
        public override string GetDesignTimeHtml()
        {
            vTB = (validateTextBox)Component;
            StringWriter sw = new StringWriter();
            HtmlTextWriter writer = new HtmlTextWriter(sw);
            vTB.RenderControl(writer);

            string myStr = @"<span style=""width:10px; height:20px;color:#ff0000;font-size:18px; line-height:18px;margin-right:-5px;margin-left:5px;"">V</span>";

            return vTB.Check ? myStr + sw.ToString() : sw.ToString();
        }