OpenFileDialog ofd = new OpenFileDialog();

             ofd.Filter = "(*.mp4)|*.mp4|(*.*)|*.*";

             ofd.RestoreDirectory = true;

             if (ofd.ShowDialog() == DialogResult.OK)

             {

                 try

                 { // 打开文件 

                     FileStream fileStream = new FileStream(ofd.FileName, FileMode.Open, FileAccess.Read, FileShare.Read);

                     // 读取文件的 byte[] 

                     byte[] brecord = new byte[fileStream.Length];

                     fileStream.Read(brecord, , brecord.Length);

                     byte[] data1 = { , , , , , ,  };

                     byte[] data2 = { , , , , , ,  };

                     var data3 = new byte[data1.Length + data2.Length + brecord.Length];

                     Stream s = new MemoryStream();

                     s.Write(data1, , data1.Length);

                     s.Write(brecord, , brecord.Length);

                     s.Write(data2, , data2.Length);

                     s.Position = ;

                     int r = s.Read(data3, , data3.Length);

                     if (r > )

                     {

                         //此时data3中就是合并的值了

                     }

                     mc.Send(data3);

                     fileStream.Close();

                 }

                 catch (Exception ex)

                 {

                     MessageBox.Show(ex.Message.ToString());

                 }

                 finally

                 {

                     //sr.Close();

                     //fs.Close();

                 }

             }