Saving base64String as image on FTP server, saves corrupted file - ftp

Question

Saving base64String as image on FTP Server is saving it as corrupted file.
I am doing following things
converted base64String into byte[].
Initialized MemoryStream with byte converted in above step.
Opened stream from FTP
Write stream on ftp.
Below is the code
public bool WriteFromBase64ToFile(string base64, string path, string fileName)
{
bool result = false;
using (FtpClient ftp = new FtpClient())
{
// setting ftp properties with required values.
ftp.ReadTimeout = 999999999;
ftp.Host = host;
ftp.Credentials = new System.Net.NetworkCredential(username, password);
ftp.Port = Convert.ToInt32(port);
ftp.DataConnectionType = FtpDataConnectionType.AutoPassive;
ftp.Connect();
ftp.ConnectTimeout = 1000000;
// converting base64String into byte array.
byte[] file = Convert.FromBase64String(base64);
if (ftp.IsConnected)
{
int BUFFER_SIZE = file.Length; // 64KB buffer
byte[] buffer = new byte[file.Length];
// Initializing MemoryStream with byte converted from base64String.
MemoryStream ms = new MemoryStream(buffer);
using (Stream readStream = ms)
{
fileName = fileName.ReplacingSpecialCharacterswithEntities();
// Getting stream from ftp and then writing it on FTP server.
using (Stream writeStream = ftp.OpenWrite(path + "/" + fileName+".jpg", FtpDataType.Binary))
{
while (readStream.Position < readStream.Length)
{
buffer.Initialize();
// Reading stream
int bytesRead = readStream.Read(buffer, 0, BUFFER_SIZE);
// Writing stream
writeStream.Write(buffer, 0, bytesRead);
}
// flushing stream.
writeStream.Flush();
}
}
}
}
result = true;
return result;
}