Work with bitmaps faster in C#

public class LockBitmap

public class LockBitmap : IDisposable

public LockBitmap(Bitmap source)
{
    this.source = source;
}

public LockBitmap(Bitmap source)
{
    this.source = source;
    LockBits();
}

public void Dispose()
{
   UnlockBits();
}

LockBitmap lockBitmap = new LockBitmap(bmp);
lockBitmap.LockBits();
(...)
lockBitmap.UnlockBits();

using(LockBitmap lockBitmap = new LockBitmap(bmp))
{
    (...)
}