private bool CheckProxy(string Url, string ProxyAddr, string ProxyUser, string ProxyPassWord, string ProxyDomain)

        {

            try

            {

                WebProxy CurrentWebProxy = new WebProxy(ProxyAddr, true);

                if (ProxyPassWord.Trim().Length > 0 && ProxyUser.Trim().Length > 0)

                    CurrentWebProxy.Credentials = new System.Net.NetworkCredential(ProxyUser, ProxyPassWord, ProxyDomain);

                else

                    CurrentWebProxy.Credentials = System.Net.CredentialCache.DefaultCredentials;

                WebRequest sr = WebRequest.Create(Url);

                sr.Proxy = CurrentWebProxy;

                sr.GetResponse();

                return true;

            }

            catch (Exception ee)

            {

                LogFile("代理服务器状态检测: 代理地址:" + ProxyAddr + "  用户名:" + ProxyUser + "  密码:" + ProxyPassWord + "  域:" + ProxyDomain + "  异常信息:" + ee.Message);