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// string postData = "__VIEWSTATE="+System.Web.HttpContext.Current.Server.UrlEncode("/wEPDwUJODcxMjQyMzU2ZGT+jaawPMKbjThOxlwGYe+5BxfYQA==");
// postData += "&__EVENTVALIDATION="+System.Web.HttpContext.Current.Server.UrlEncode("/wEWBgK1y42BCwLc3tynBALc3uCnBALc3tSnBALc3tinBAKmp46bBAtocAmNR1c0tmcUJP+o2bkbnddh");
string postData = "ctl00$ContentPlaceHolder1$TextBox0=";
postData += "&ctl00$ContentPlaceHolder1$TextBox1=北京";// +System.Web.HttpContext.Current.Server.UrlEncode("");
postData += "&ctl00$ContentPlaceHolder1$TextBox2=上海";
postData += "&ctl00$ContentPlaceHolder1$TextBox3=";
postData += "&ctl00$ContentPlaceHolder1$SearchBtn=查询";
postData += "&page=2";
postData += "&t=-1";
byte[] data = System.Text.Encoding.UTF8.GetBytes(postData);
HttpWebRequest myRequest = (HttpWebRequest)WebRequest.Create("http://huoche.name/TicketList.aspx");
myRequest.Method = "POST";
myRequest.ContentType = "application/x-www-form-urlencoded";
myRequest.ContentLength = data.Length;
System.IO.Stream newStream = myRequest.GetRequestStream();
newStream.Write(data, 0, data.Length);
newStream.Close();
HttpWebResponse myResponse = (HttpWebResponse)myRequest.GetResponse();
System.IO.StreamReader reader = new System.IO.StreamReader(myResponse.GetResponseStream(), System.Text.Encoding.UTF8);
string content=reader.ReadToEnd();
textBox1.Text = content;