отправка
 FileInfo inf = new FileInfo(strData);
                            SendData(info, inf.Name + "@" + Convert.ToString(inf.Length));
                            FileStream Stream = File.OpenRead(strData);
                            byte[] Buffer = new byte[128];
                            byte[] BytesInArray;
                            int BytesRead = -1;
                            while (BytesRead != 0)
                            {
                                BytesRead = Stream.Read(Buffer, 4, 124);
                                BytesInArray = BitConverter.GetBytes(BytesRead);
                                BytesInArray.CopyTo(Buffer, 0);
                            }
                            Stream.Close();

прием
string[] tx = strData.Split('@');
                            string nam = tx[0];
                            int size = Convert.ToInt32(tx[1]+5);
                            textBox1.Text = tx[0];
                            textBox2.Text = tx[1];

                            FileStream Writing = File.OpenWrite(path1 + "\\" + nam);
                            byte[] Buffer = new byte[128];
                            byte[] BytesInArray = BitConverter.GetBytes(-1);
                            BytesInArray.CopyTo(Buffer, 0);
                            while (BitConverter.ToInt32(Buffer, 0) != 0)
                            {
                                Writing.Write(Buffer, 4, BitConverter.ToInt32(Buffer, 0));
                            }
                            Writing.Close();

запись
  FileStream Stream = File.OpenRead(strData);
                            byte[] Buffer = new byte[128];
                            byte[] BytesInArray;
                            int BytesRead = -1;
                            while (BytesRead != 0)
                            {
                                BytesRead = Stream.Read(Buffer, 4, 124);
                                BytesInArray = BitConverter.GetBytes(BytesRead);
                                BytesInArray.CopyTo(Buffer, 0);
                                //Stream.Read(BytesInArray, 0, BytesInArray.Length);
                            }
                            Stream.Close();    

прием
                            FileStream Writing = File.OpenWrite(path1 + "\\" + nam);
                            byte[] Buffer = new byte[128];
                            byte[] BytesInArray = BitConverter.GetBytes(-1);
                            BytesInArray.CopyTo(Buffer, 0);
                            while (BitConverter.ToInt32(Buffer, 0) != 0)
                            {
                                Writing.Write(Buffer, 4, BitConverter.ToInt32(Buffer, 0));///отрицательное число count
                            }
                            Writing.Close();