///<summary>
        ///测试拨号连接
        ///</summary>
privatevoidbtnTest_Click(objectsender, EventArgs e)
        {
            try
            {
                RasDialer dialer =newRasDialer();
                dialer.EntryName ="联通网络";
                dialer.PhoneNumber ="";
                dialer.AllowUseStoredCredentials =true;
                dialer.PhoneBookPath =RasPhoneBook.GetPhoneBookPath(RasPhoneBookType.AllUsers);
                dialer.Timeout =1000;
                dialer.Dial();

Thread.Sleep(100);
                this.LoadConnections();
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.ToString());
            }
        }

/// <summary>
        /// 断开网络连接
        /// </summary>
        private void btnLogout_Click(object sender, EventArgs e)
        {
            ReadOnlyCollection<RasConnection> conList = RasConnection.GetActiveConnections();
            foreach (RasConnection con in conList)
            {
                con.HangUp();
            }

this.LoadConnections();
        }

private void Form1_Load(object sender, EventArgs e)
        {
             this.LoadConnections();
        }

/// <summary>
        /// 显示活动的连接
        /// </summary>
        private void LoadConnections()
        {
            this.comboBox1.Items.Clear();
            this.comboBox1.Items.Add(new ComboBoxItem("请选择一个链接...", null));
            foreach (RasConnection connection in RasConnection.GetActiveConnections())
            {
                this.comboBox1.Items.Add(new ComboBoxItem(connection.EntryName, connection.EntryId));
            }

this.comboBox1.SelectedIndex = 0;
        }

private void comboBox1_SelectedIndexChanged(object sender, EventArgs e)
        {
            this.GetAddressButton.Enabled = this.comboBox1.SelectedIndex > 0;
        }

/// <summary>
        /// 获取IP地址信息
        /// </summary>
        private void GetAddressButton_Click(object sender, EventArgs e)
        {
            StringBuilder sb = new StringBuilder();
            foreach (RasConnection connection in RasConnection.GetActiveConnections())
            {
                if (connection.EntryId == (Guid)((ComboBoxItem)this.comboBox1.SelectedItem).Value)
                {
                    RasIPInfo ipAddresses = (RasIPInfo)connection.GetProjectionInfo(RasProjectionType.IP);
                    if (ipAddresses != null)
                    {
                        sb.AppendFormat("ClientIP:{0}\r\n", ipAddresses.IPAddress.ToString());
                        sb.AppendFormat("ServerIP:{0}\r\n", ipAddresses.ServerIPAddress.ToString());
                    }
                }
                sb.AppendLine();
            }
            MessageBox.Show(sb.ToString());
        }

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撰写人：伍华聪  http://www.iqidi.com