Plese help me ....... When I compile this code from command line ("csc cliente.cs"): Code: //////////////////////////////////////////////////////////////////////////////// using System; using System.Net.Sockets; public class TcpClient : IDisposable{ void IDisposable.Dispose(); static void Connect(String server, String message) { try { // Create a TcpClient. // Note, for this client to work you need to have a TcpServer // connected to the same address as specified by the server, port // combination. Int32 port = 13000; TcpClient client = new TcpClient(server, port); // Translate the passed message into ASCII and store it as a Byte array. Byte[] data = System.Text.Encoding.ASCII.GetBytes(message); // Get a client stream for reading and writing. // Stream stream = client.GetStream(); NetworkStream stream = client.GetStream(); // Send the message to the connected TcpServer. stream.Write(data, 0, data.Length); Console.WriteLine("Sent: {0}", message); // Receive the TcpServer.response. // Buffer to store the response bytes. data = new Byte[256]; // String to store the response ASCII representation. String responseData = String.Empty; // Read the first batch of the TcpServer response bytes. Int32 bytes = stream.Read(data, 0, data.Length); responseData = System.Text.Encoding.ASCII.GetString(data, 0, bytes); Console.WriteLine("Received: {0}", responseData); // Close everything. stream.Close(); client.Close(); } catch (ArgumentNullException e) { Console.WriteLine("ArgumentNullException: {0}", e); } catch (SocketException e) { Console.WriteLine("SocketException: {0}", e); } Console.WriteLine("\n Press Enter to continue..."); Console.Read(); } } ///////////////////////////////////////////////////////////////////////////////////////////////////// This error appear TcpClient.System.IDispose.Dispose() must declare a body cause it is not marked abstract or extern