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string uriStr = "http://wo.zp365.com/public/loginZPGY.aspx";
string strId = "test0001";
string strPassword = "123456";
NameValueCollection postVars = new NameValueCollection();
var postData = new NameValueCollection();
postData.Add("__EVENTTARGET", "");
postData.Add("__EVENTARGUMENT", "");
postData.Add("__LASTFOCUS", "");
postData.Add("___gathersOwner", "");
postData.Add("__VIEWSTATE", "/wEPDwULLTE0Nzg3Mzg0MDdkGAEFHl9fQ29udHJvbHNSZXF1aXJlUG9zdEJhY2tLZXlfXxYIBRhjdGwwMCRDb250ZW50UGFnZSR1c2VyMDEFGGN0bDAwJENvbnRlbnRQYWdlJHVzZXIwNQUYY3RsMDAkQ29udGVudFBhZ2UkdXNlcjA0BR1jdGwwMCRDb250ZW50UGFnZSRyYWRpb25VbmlvbgUdY3RsMDAkQ29udGVudFBhZ2UkcmFkaW9uVW5pb24FGGN0bDAwJENvbnRlbnRQYWdlJHVzZXIwMwUYY3RsMDAkQ29udGVudFBhZ2UkdXNlcjAyBSNjdGwwMCRDb250ZW50UGFnZSRJbWFnZUJ1dHRvbk93bmVyMQ==");
postData.Add("__EVENTVALIDATION", "/wEWCgK2h8HNCQLL9pTeBwLgupWyCgKo46qxDAL+uKHaBQLwtbrgBwLBhqDPBgKz9+YEApjEiK4DAoePzpIJ");
postData.Add("ctl00$ContentPage$zp365tbLoginUserName", strId);
postData.Add("ctl00$ContentPage$zp365tbLoginPassword", strPassword);
postData.Add("ctl00$ContentPage$zp365drpLoginOldUser", "user01");
postData.Add("ctl00$ContentPage$ImageButtonOwner1.x", "50");
postData.Add("ctl00$ContentPage$ImageButtonOwner1.y", "14");
var client = new WebClient();
client.Headers.Add("Content-Type", "application/x-www-form-urlencoded");
client.Headers.Add("User-Agent", "Mozilla/4.0");
var data = client.UploadValues(uriStr, "POST", postData);
this.textBox1.Text = System.Text.Encoding.UTF8.GetString(data);
if (this.textBox1.Text.Contains("用户或者密码错误!"))
MessageBox.Show("Failure");
else if (this.textBox1.Text.Contains("已经登录1,2,3,4,5,6,7,8,5"))
MessageBox.Show("Success");
<script language=JavaScript>alert('用户或者密码错误!')</script>