没有图形化显示，继承Control类

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

/**//// <summary>
/// TestRender 的摘要说明
/// </summary>
namespace USERControls
{
    public class TestRender : System.Web.UI.Control
    {
        public TestRender()
        {
            //
            // TODO: 在此处添加构造函数逻辑
            //
        }


        protected override void Render(HtmlTextWriter writer)
        {

            writer.AddAttribute(HtmlTextWriterAttribute.Href, "http://www.163.com");

            writer.AddStyleAttribute(HtmlTextWriterStyle.Color, "red");

            writer.RenderBeginTag(HtmlTextWriterTag.A);

            writer.Write("dd");

            writer.RenderEndTag();

           
            
            base.Render(writer);
        }
    }
}