Problem in receving file with socket - C#

See more:

C#

sockets

Hi,
I'm trying to send a file over socket from server to client ( im using Reverse Connection method )
So here is my steps:
0-send a upload request to client
1-reading file lenght + filename
2-send details to client
3-client will create a byte array with the calculated length
3-reading file from server into byte array
4-send byte with socket.send(byte,0,byte.lenght,socketflag.none)

But the problem is when i receive the "File Received" from the client, my file is broken.
How can i fix this?

What I have tried:

The ReceiveInfo() method is for client-side

static private void ReceiveInfo() //Client receving data check if its a normal command or request to download a file
            {
                byte[] buffer = new byte[1024];
                int received = 0;

                try
                {
                    received = ClientSocket.Receive(buffer);
                }
                catch (SocketException)
                {
                    //
                }

                if (received == 0)
                    return;

                byte[] data = new byte[received];
                System.Array.Copy(buffer, data, received);

                if(IsDownload)
                {
                    DownloadCommand(data);
                }

                else
                {
                    NormalCommand(data);
                }

            }

when i send the upload request,the flag of IsDownload will change to true.
Here is the step 3: (when client recevies the download request)

string[] info = // it contains details of file
FileName = info[1];
FileSize = int.Parse(info[2]);
FileBytes = new byte[FileSize];
IsDownload = true;

Client receives the info,create byte array and waiting for server to send the data.

public static void DownloadCommand(byte[] data)
            {


                    Buffer.BlockCopy(data, 0, FileBytes, WriteSize, data.Length);

                    WriteSize += data.Length;


                if (FileBytes.Length == FileSize)
                {
                    try
                    {
                        using (FileStream fs = File.Create(FileName))
                        {
                            byte[] info = FileBytes;
                            fs.Write(info, 0, info.Length);
                        }

                        Array.Clear(FileBytes, 0, FileBytes.Length);
                    }
                    catch (Exception ex)
                    {

                    }
                    SendData("File Received.");
                    IsDownload = false;
                    WriteSize = 0;
                }
            }

And here is the server codes:

public static void SendFile(Socket s, string fileName)
            {
                try
                {
                    if (s.Connected)
                    {
                        TargetClient = s;
                        byte[] dataToSend = File.ReadAllBytes(fileName);
                        string fileInfo = Path.GetFileName(fileName) + "~" + dataToSend.Length;
                        SendCommand("IsDownload~" + fileInfo);
                        TargetClient.Send(dataToSend,0,dataToSend.Length,SocketFlags.None);
                    }

                }

                catch (Exception ex)
                {
                    LogManager.SetLog("Error in SendFile(Socket,string):\n" + ex.Message);
                };

            }