C#.net模拟提交表单POST [方法一测试成功]

System.Net.WebClient WebClientObj        = new System.Net.WebClient(); 
   System.Collections.Specialized.NameValueCollection PostVars  = new System.Collections.Specialized.NameValueCollection(); 
   PostVars.Add("A1","0"); 
   PostVars.Add("A2","0"); 
   PostVars.Add("A3","000"); 
   try 
   { 
    byte[] byRemoteInfo   = WebClientObj.UploadValues("http://www.lovezhao.com/vote.asp","POST",PostVars); 
    //下面都没用啦，就上面一句话就可以了 
    string sRemoteInfo   = System.Text.Encoding.Default.GetString(byRemoteInfo);   
    //这是获取返回信息 
    richTextBox_instr.Text  += sRemoteInfo; 
   } 
   catch 
   {}