Error C#

 Thread.Sleep(1000);
 
            string extensionowner = "2205";
            // Console.WriteLine(userName);
 
            // Connect to the asterisk server. 
 
            Socket clientSocket = new Socket(AddressFamily.InterNetwork, SocketType.Stream, ProtocolType.Tcp);
            IPEndPoint serverEndPoint = new IPEndPoint(IPAddress.Parse("192.168.1.50"), 5038);
            clientSocket.Connect(serverEndPoint);
 
            // Login to the server; manager.conf needs to be setup with matching credentials. 
            clientSocket.Send(Encoding.ASCII.GetBytes("Action: Login\r\nUsername: outplus\r\nSecret: telephony\r\nActionID: 1\r\n\r\n"));
 
            int bytesRead = 0;
 
            do
            {
                byte[] buffer = new byte[1024];
                bytesRead = clientSocket.Receive(buffer);
 
                //Console.WriteLine(bytesRead + " bytes from asterisk server."); 
 
 
                string response = Encoding.ASCII.GetString(buffer, 0, bytesRead);
                string oneline = response;
                //string newresponse = oneline;
 
                char[] MyChar = { ' ', '\r', '\n', ' ' };
                string newresponse = oneline.TrimEnd(MyChar);
                newresponse = newresponse.Replace("\r", " ");
                newresponse = newresponse.Replace("\n", "|");
 
 
                //...............................................
 
 
 
 
                //................................................
 
 
 
 
                // get in to one line 
 
                // get      
 
                newresponse = newresponse.Replace("Event:", "\nEvent:");
                // Console.Write ("\n" + newresponse);
 
                string Event = "";
                string Source = "";
                string Destination = "";
                string CallerID = "";
                string CallerIDNum = "";
                string Srcuniqueid = "";
                string DestUniqueID = "";
                string Channel = "";
 
 
 
                string arg = newresponse;
                string[] argPair = arg.Split(new char[] { '|' });
                foreach (string str in argPair)
                {
                    string[] pair = str.Split(new char[] { ':' });
                    switch (pair[0].Trim().ToLower())
                    {
                        case "event":
                            Event = pair[1].Trim();
                            break;
                        case "channel":
                            Channel = pair[1].Trim();
                            break;
                        case "source":
                            Source = pair[1].Trim();
                            break;
                        case "destination":
                            Destination = pair[1].Trim();
                            break;
                        case "callerid":
                            CallerID = pair[1].Trim();
                            break;
                        case "calleridnum":
                            CallerIDNum = pair[1].Trim();
                            break;
                        case "srcuniqueid":
                            Srcuniqueid = pair[1].Trim();
                            break;
                        case "destuniqueid":
                            DestUniqueID = pair[1].Trim();
                            break;
                    }
 
 
 
 
                }
                // EXTENSION IDENTIFIER 
 
                if (Source != "")
                {
                    //filter source 
                    string originalString = @Source;
                    char divider1 = '/';
                    char divider2 = '-';
                    int indexOfDivider1 = originalString.IndexOf(divider1);
                    int indexOfDivider2 = originalString.IndexOf(divider2);
                    string str1 = originalString.Substring(0, indexOfDivider1);
                    string str2 = divider1.ToString(); //originalString.Substring(3, 1);
                    Source = originalString.Substring(indexOfDivider1 + 1, indexOfDivider2 - indexOfDivider1 - 1);
                    string str4 = divider2.ToString();
                    string str5 = originalString.Substring(indexOfDivider2 + 1);
 
                    //filter Destination
                    originalString = @Destination;
                    divider1 = '/';
                    divider2 = '-';
                    indexOfDivider1 = originalString.IndexOf(divider1);
                    indexOfDivider2 = originalString.IndexOf(divider2);
                    str1 = originalString.Substring(0, indexOfDivider1);
                    str2 = divider1.ToString(); //originalString.Substring(3, 1);
                    Destination = originalString.Substring(indexOfDivider1 + 1, indexOfDivider2 - indexOfDivider1 - 1);
                    str4 = divider2.ToString();
                    str5 = originalString.Substring(indexOfDivider2 + 1); 
 
 
                    Console.WriteLine("\n[Source]" + Source + "[Source]" + "[Destination]" + Destination + "[Destination]" + "[CALLERID]" + CallerID + "[CALLERID]");
                }
                // EXTENSION 
 
                if (Destination != "" & DestUniqueID != "")
                {
 
 
                    /*
                    string originalString = @Destination;
                    char divider1 = '/';
                    char divider2 = '-';
                    int indexOfDivider1 = originalString.IndexOf(divider1);
                    int indexOfDivider2 = originalString.IndexOf(divider2);
                    string str1 = originalString.Substring(0, indexOfDivider1);
                    string str2 = divider1.ToString(); //originalString.Substring(3, 1);
                    string extDest = originalString.Substring(indexOfDivider1 + 1, indexOfDivider2 - indexOfDivider1 - 1);
                    string str4 = divider2.ToString();
                    string str5 = originalString.Substring(indexOfDivider2 + 1);
                    Console.WriteLine(); */
 
 
 
                    if (Destination == extensionowner)
                    {
                        Console.Write(CallerID);
                        TextWriter tw = new StreamWriter("c:\\number.txt");
                        // write a line of text to the file
                        tw.WriteLine(CallerID);
                        // close the stream
                        tw.Close();
                        Thread.Sleep(1000);
 
                    }

                                              

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