Stream to Byte[]

/* - - - - - - - - - - - - - - - - - - - - - - - - 
 * Stream   byte[]  
 * - - - - - - - - - - - - - - - - - - - - - - - */
/// <summary>
///   Stream   byte[]
/// </summary>
public byte[] StreamToBytes(Stream stream)
{
    byte[] bytes = new byte[stream.Length];
    stream.Read(bytes, 0, bytes.Length);

    //  
    stream.Seek(0, SeekOrigin.Begin);
    return bytes;
}

/// <summary>
///   byte[]   Stream
/// </summary>
public Stream BytesToStream(byte[] bytes)
{
    Stream stream = new MemoryStream(bytes);
    return stream;
}


/* - - - - - - - - - - - - - - - - - - - - - - - - 
 * Stream    
 * - - - - - - - - - - - - - - - - - - - - - - - */
/// <summary>
///   Stream  
/// </summary>
public void StreamToFile(Stream stream,string fileName)
{
    //   Stream   byte[]
    byte[] bytes = new byte[stream.Length];
    stream.Read(bytes, 0, bytes.Length);
    //  
    stream.Seek(0, SeekOrigin.Begin);

    //   byte[]  
    FileStream fs = new FileStream(fileName, FileMode.Create);
    BinaryWriter bw = new BinaryWriter(fs);
    bw.Write(bytes);
    bw.Close();
    fs.Close();
}

/// <summary>
///   Stream
/// </summary>
public Stream FileToStream(string fileName)
{            
    //  
    FileStream fileStream = new FileStream(fileName, FileMode.Open, FileAccess.Read, FileShare.Read);
    //   byte[]
    byte[] bytes = new byte[fileStream.Length];
    fileStream.Read(bytes, 0, bytes.Length);
    fileStream.Close();
    //   byte[]   Stream
    Stream stream = new MemoryStream(bytes);
    return stream;
}