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using (FileStream fs = new FileStream(pathToTarget + received.Filename, FileMode.Create))
{
    int readCount = 0;
    //try as long as the whole file is written
    while (readCount < received.FileLength)
    {
        //reading and writing data
        if(clientData.DataAvailable)
        {
            Byte[] buffer = new Byte[1024];
            readCount += clientData.Read(buffer, 0, buffer.Length);
            if (readCount > received.FileLength)
            {
                long lastPart = received.FileLength - (readCount - buffer.Length);
                fs.Write(buffer, 0, (int)lastPart);
                break;
            }
            fs.Write(buffer, 0, buffer.Length);
        }
    }
    fs.Close();
    clientData.Close();
    //verify the file hash
    if (!received.getFileHash(pathToTarget + received.Filename).Equals(received.HashFile))
    {
        //delete the file because it has a error
        //File.Delete(pathToTarget + received.Filename);
        MessageBox.Show("File transmission failed! (File deleted!)");
                                    }
        //interrupt the infinite loop
        break;
    }                    

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bytes = new Byte[1024];
//send the file
while (true)
{
    int readCount = fs.Read(bytes, 0, bytes.Length);
    nsStream.Write(bytes, 0, bytes.Length);
    if (readCount == 0)
    {
        break;
    }
}                    

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nsStream.Write(bytes, 0, readCount);                    

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int count = clientData.Read(buffer, 0, buffer.Length);
readCount += count;
fs.Write(buffer, 0, count);