public static string PostUrl(string[] urls) 
    { 
        try
        { 
            string formUrl = "http://data.zz.baidu.com/urls"; 
     
            string formData = ""; 
     
            foreach (string url in urls) 
            { 
                formData += url + "\n"; 
            } 
     
            byte[] postData = System.Text.Encoding.UTF8.GetBytes(formData); 
     
            // 设置提交的相关参数  
            System.Net.HttpWebRequest request = System.Net.WebRequest.Create(formUrl) as System.Net.HttpWebRequest; 
            System.Text.Encoding myEncoding = System.Text.Encoding.UTF8; 
            request.Method = "POST"; 
            request.KeepAlive = false; 
            request.AllowAutoRedirect = true; 
            request.ContentType = "text/plain"; 
            request.UserAgent = "curl/7.12.1"; 
            request.ContentLength = postData.Length; 
     
            // 提交请求数据  
            System.IO.Stream outputStream = request.GetRequestStream(); 
            outputStream.Write(postData, 0, postData.Length); 
            outputStream.Close(); 
     
            System.Net.HttpWebResponse response; 
            System.IO.Stream responseStream; 
            System.IO.StreamReader reader; 
            string srcString; 
            response = request.GetResponse() as System.Net.HttpWebResponse; 
            responseStream = response.GetResponseStream(); 
            reader = new System.IO.StreamReader(responseStream, System.Text.Encoding.GetEncoding("UTF-8")); 
            srcString = reader.ReadToEnd(); 
            string result = srcString;   //返回值赋值 
            reader.Close(); 
     
            return result; 
        } 
        catch(Exception ex) 
        { 
            return ex.Message; 
        } 
    }

 //点击按钮触发
    protected void Button1_Click(object sender, EventArgs e)
    {
      string info = PostUrl(new string[] { "//www.jb51.net/", "//www.jb51.net/article/3.html" }); 
      this.Label1.Text= info; 
    }