when transfered file to client (from server) , show messbox and .... ---> via socet programing

hello all

i want to make "Transfer Larg File" using Socket Application . . . .

i made it and every thing is ok .

But I want, when the filetransferewascomplete,a messageindicating and Finally,NetworkStream is closed ...

part of my code:

 public void SendFile(string remoteHostIP, int remoteHostPort, string longFileName, string shortFileName)
        {
            try
            {
                if (!string.IsNullOrEmpty(remoteHostIP))
                {
                    byte[] fileNameByte = Encoding.ASCII.GetBytes(shortFileName);
                    byte[] fileData = File.ReadAllBytes(longFileName);
                    byte[] clientData = new byte[4 + fileNameByte.Length + fileData.Length];
                    byte[] fileNameLen = BitConverter.GetBytes(fileNameByte.Length);
                    fileNameLen.CopyTo(clientData, 0);
                    fileNameByte.CopyTo(clientData, 4); fileData.CopyTo(clientData, 4 + fileNameByte.Length);
                    TcpClient clientSocket = new TcpClient(remoteHostIP, remoteHostPort);
                    NetworkStream networkStream = clientSocket.GetStream();
                    networkStream.Write(clientData, 0, clientData.GetLength(0));
                    /// here is my Problem -- if ( ? ? ? ? ) {}
                    networkStream.Close();
                    MessageBox.Show("file Received");
                }
                else
                {
                    MessageBox.Show("Error...1");
                }
            }
            catch
            {
                MessageBox.Show("Error...2");

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