http驗證CertificateValidation

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private void btnopenURL_Click(object sender, EventArgs e)
{

string strUrl = txtopenURL.Text.Trim();
// webBrowser1.Navigate(strUrl);
//ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(CheckValidationResult);//驗證伺服器憑證回調自動驗證
//建立http連結
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(strUrl);
/**
request.Credentials = CredentialCache.DefaultCredentials;
request.Credentials = new NetworkCredential("user", "密碼", strUrl);
**/
string username = "user";
string password = "二次密碼";//注意這裡的格式哦，為 "username:password"
string usernamePassword = username + ":" + password;
CredentialCache mycache = new CredentialCache();
mycache.Add(new Uri(strUrl), "Basic", new NetworkCredential(username, password));
request.Credentials = mycache;
request.Headers.Add("Authorization", "Basic " + Convert.ToBase64String(new ASCIIEncoding().GetBytes(usernamePassword)));
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
//構造資料流對象執行個體
WebResponse stream = request.GetResponse();
Stream receiveStream = stream.GetResponseStream(); //GetResponseStream:擷取應答流
StreamReader reader = new StreamReader(receiveStream, Encoding.UTF8);//從位元組流中讀取字元
string content = reader.ReadToEnd(); //從流當前位置讀取到末尾並顯示在WebBrower控制項中
webBrowser1.DocumentText = content;

 }

http驗證CertificateValidation