C#

private void button2_Click(object sender, EventArgs e)
{
    FileStream filetoupload = new FileStream("C:\\projects\\testfile.csv", FileMode.Open);
    Uri address = new Uri("http://devsrvr/hints/");

    HttpWebRequest webreq = HttpWebRequest.Create(address) as HttpWebRequest;

    // set type to post
    webreq.Method = "POST";
    webreq.ContentType = "application/x-www-form-urlencoded";
    webreq.Timeout = 15 * 1000;
    // data we want to send, which is pretty much a file

    byte[] bytedata = UTF8Encoding.UTF8.GetBytes(filetoupload.ToString());
    webreq.ContentLength = bytedata.Length;

    try
    {
        using (Stream poststream = webreq.GetRequestStream())
        {
            poststream.Write(bytedata, 0, bytedata.Length);
        }
        MessageBox.Show("done!!");
    }
    catch (Exception ex)
    {
        ex.InnerException.ToString();
        ex.Source.ToString();
        ex.Message.ToString();
    }
}

private player ByteArrayToPlayer(byte[] temp)
        {
            try
            {
                MemoryStream objectStream = new MemoryStream(temp);

                IFormatter BinaryFormatter
                            = new BinaryFormatter();

                objectStream.Position =0;
              
                return (player)BinaryFormatter.Deserialize(objectStream);     <--- get exception
            }
            catch (Exception ex)
            {
                ;
            }
            return null;


        }
        private byte[] PlayerToByteArray(player o)
        {
            try
            {
                objectStream = new MemoryStream();

               IFormatter BinaryFormatter
                            = new BinaryFormatter();
                
                BinaryFormatter.Serialize(objectStream, o);
                objectStream.Seek(0, SeekOrigin.Begin);
                return objectStream.ToArray();
            }
            catch (Exception ex)
            {
                ;

            }

            return null;
        }

Here are classes which serialize and deserialize.

[Serializable()]
        public class player :ISerializable
       {
           public byte[] temp;
           public int id;
           public bool isConnected;
           public cube[] receivedCubes;
           public cube[] cubesToSend;
           public string name;
           public bool isLoaded = false;
           public List<index>[] indexes;         // list of field indexes

           public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
           {
               info.AddValue("receivedCubes", receivedCubes);
               info.AddValue("name", name);
               info.AddValue("temp", temp);
               info.AddValue("isConnected", isConnected);
               info.AddValue("isLoaded", isLoaded);
               info.AddValue("cubesToSend", cubesToSend);
               info.AddValue("indexes", indexes);
               info.AddValue("id", id);
               
           }
           public player()
           { }

           public player(SerializationInfo info, StreamingContext ctxt)
           {
               receivedCubes = (cube[])info.GetValue("receivedCubes", typeof(cube[]));
               name = (String)info.GetValue("name", typeof(string));
               temp = (byte[])info.GetValue("temp", typeof(byte[]));
               isConnected = (bool)info.GetValue("isConnected", typeof(bool));
               isLoaded = (bool)info.GetValue("isLoaded", typeof(bool));
               cubesToSend = (cube[])info.GetValue("cubesToSend", typeof(cube[]));
               indexes = (List<index>[])info.GetValue("indexes", typeof(List<index>[]));
               id = (int)info.GetValue("id", typeof(int));

           }



       }

 [Serializable()]
        public class index   //object idex indicate where cube entry on the screen from other player
        {
            public int x;       
            public int y;
            public int indexOfTargetCube;     // that mark own of index( cube)
            public byte direct;
            public index()
            {
            }

              public index (SerializationInfo info, StreamingContext ctxt)
           {

               x = (int)info.GetValue("x", typeof(int));
               y = (int)info.GetValue("y", typeof(int));
               indexOfTargetCube = (int)info.GetValue("temp", typeof(int));
               direct=(byte)info.GetValue("isConnected",typeof(byte));
              
           
           }
              public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
            {
                info.AddValue("x", x);
                info.AddValue("y", y);
                info.AddValue("indexOfTargetCube", indexOfTargetCube);
                info.AddValue("direct", direct);
               

            }

        }


 [Serializable()]
    public class cube :ISerializable
    {
        public int x;  // position x
        public int y;   // position y
        public int size;  // size of cube
        public byte direct=2;  // direct , default is rigtUp=2;
        public  byte speed;    // speed cube
        public bool live;      // isLive ???
        public int room = 0;   // where cube is
        public bool isOut;     // idicate for dealer, that is cube out from players
        public bool isMarked = false; // indicate that cube have index
        public byte numOfExit = 0;    // num. of exit for dealer
        public int exploseTimer = 0;   // timer for explose
        public byte sizeTimer;          // timer for size cube
        public byte speedTimer=0;      // timer for speed cube
        public byte stopTimer=0;      // timer for stop cube
        public byte lastDirect=0;      // last direct, if cube keep position
        public int assumeX = 0;        // for index calculate
        public int assumeY=0;          // for index calculate

public cube()
        {

        }

public void GetObjectData(SerializationInfo info, StreamingContext ctxt)
        {
            info.AddValue("x", x);
            info.AddValue("y", y);
            info.AddValue("size", size);
            info.AddValue("direct", direct);
            info.AddValue("speed", speed);
            info.AddValue("live", live);
            info.AddValue("room", room);
            info.AddValue("isOut", isOut);
            info.AddValue("isMarked", isMarked);
            info.AddValue("numOfExit", numOfExit);
            info.AddValue("exploseTimer", exploseTimer);
            info.AddValue("sizeTimer", sizeTimer);
            info.AddValue("speedTimer", speedTimer);
            info.AddValue("stopTimer", stopTimer);
            info.AddValue("lastDirect", lastDirect);
            info.AddValue("assumeY", assumeY);
            info.AddValue("assumeY", assumeY);

        }


public cube(SerializationInfo info, StreamingContext ctxt)
           {
               x=(int)info.GetValue("x", typeof(int));
               y=(int)info.GetValue("y", typeof(int));
               size=(int)info.GetValue("size", typeof(int));
               direct=(byte)info.GetValue("direct",typeof(byte));
               speed=(byte)info.GetValue("speed", typeof(byte));
               live=(bool)info.GetValue("live", typeof(bool));
               room=(int)info.GetValue("room", typeof(int));
               isOut=(bool)info.GetValue("isOut", typeof(bool));
               isMarked=(bool)info.GetValue("isMarked",typeof(bool));
               numOfExit=(byte)info.GetValue("numOfExit",typeof(byte));
               exploseTimer=(int)info.GetValue("exploseTimer",typeof(int));
               sizeTimer=(byte)info.GetValue("sizeTimer",typeof(byte));
               speedTimer=(byte)info.GetValue("speedTimer",typeof(byte));
               stopTimer=(byte)info.GetValue("stopTimer",typeof(byte));
               lastDirect=(byte)info.GetValue("lastDirect",typeof(byte));
               assumeX=(int)info.GetValue("assumeY",typeof(int));
               assumeY=(int)info.GetValue("assumeY",typeof(int));
         
           }
}