C#

class SMSManager
    {
public string abc;
public void testMethod(string MPN, string RPN, string text)
        {
            SMSModem SMSMdm = new SMSModem();

            MessageBox.Show("RPN" + RPN);
abc = RPN;  //this isnt wrking
           
// HERE I HAVE A STRING CALLED RPN WHICH I WANT TO CALL INTO ANOTHER CLASS. THE RPN VALUE SHOULD
//BE THE SAME AS WHEN THE CODE EXECUTES THE ABOVE MESSAGEBOX CODE.

            int x = myArray.Length / 5;
           
            for (int i = 0; i < x; i++)
            {
                string a = myArray[i, 0];
                if (a == MPN)
                {
                    MessageBox.Show("MODEM NUMBER :"+MPN);
                    SMSModem SMSM = new SMSModem();
                    SMSM.SendSms();
                }
               
            }
             
           
        }

class SMSModem
    {
public bool SendSms()
        {
            try
            {
                SMSManager MGR = new SMSManager();
                string num = MGR.abc;  //This is not retreiving the value!

//I WANT THAT VALUE TO BE CALLED HERE AND ASSIGN IT TO "num"
                MessageBox.Show("RECEIRE" +num);
               
                serialPort1.WriteLine("AT+CMGF=1;+CSCA=\"+6598540020\";+CMGS=\"+65" + num + "\"\r\n");
                System.Threading.Thread.Sleep(40);
                serialPort1.Write("Test message from coded program");

                char[] arr = new char[1];

                arr[0] = (char)26; //ascii value of Ctrl-Z

                serialPort1.Write(arr, 0, 1);

                System.Threading.Thread.Sleep(3000);
                string data = serialPort1.ReadExisting();

                MessageBox.Show(data);

                if (data.IndexOf("OK") != -1)
                {
                    return true;
                }
                else
                {
                    return false;
                }
            }
            catch
            {
                return false;
            }
        }
       
    }

Client:

       static void Main(string[] args)
        {
            Console.Write("\nPlease enter the URI to post data to : ");
            String uriString = Console.ReadLine();

            WebClient myWebClient = new WebClient();

            Console.WriteLine("\nPlease enter the fully qualified path of the file to be uploaded to the URI");
            string fileName = Console.ReadLine();
            Console.WriteLine("Uploading {0} to {1} ...", fileName, uriString);

            DateTime begin = DateTime.Now;

            byte[] responseArray = null;
            try
            {
                responseArray = myWebClient.UploadFile(uriString, fileName);
            }
            catch (Exception ex)
            {
                Console.WriteLine(ex.Message);
                Console.WriteLine(ex.ToString());
            }

            DateTime end = DateTime.Now;

            Console.WriteLine("Elapsed time is: {0}", (end - begin).TotalMilliseconds);
        }

Server:

    public partial class FileUploadHandler : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            foreach (string f in Request.Files.AllKeys)
            {
                HttpPostedFile file = Request.Files[f];
                file.SaveAs("D:\\UploadFile\\UploadedFiles\\" + file.FileName);
            }
        }
    }

Exception from client side:

Unable to connect to the remote server
System.Net.WebException: Unable to connect to the remote server ---> System.Net.
Sockets.SocketException: No connection could be made because the target machine
actively refused it 10.10.12.162:1031
   at System.Net.Sockets.Socket.DoConnect(EndPoint endPointSnapshot, SocketAddre
ss socketAddress)
   at System.Net.ServicePoint.ConnectSocketInternal(Boolean connectFailure, Sock
et s4, Socket s6, Socket& socket, IPAddress& address, ConnectSocketState state,
IAsyncResult asyncResult, Int32 timeout, Exception& exception)
   --- End of inner exception stack trace ---
   at System.Net.WebClient.UploadFile(Uri address, String method, String fileNam
e)
   at FileUploadClient.Program.Main(String[] args) in D:\UploadFile\FileUploadClient\Program.cs:line 30