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private void LockUnlockBitsExample(PaintEventArgs e)
    {
 
        // Create a new bitmap.
        Bitmap bmp = new Bitmap("c:\\fakePhoto.jpg");
 
        // Lock the bitmap's bits.  
        Rectangle rect = new Rectangle(0, 0, bmp.Width, bmp.Height);
        System.Drawing.Imaging.BitmapData bmpData =
            bmp.LockBits(rect, System.Drawing.Imaging.ImageLockMode.ReadWrite,
            bmp.PixelFormat);
 
        // Get the address of the first line.
        IntPtr ptr = bmpData.Scan0;
 
        // Declare an array to hold the bytes of the bitmap.
        int bytes  = bmpData.Stride * bmp.Height;
     byte[] rgbValues = new byte[bytes];
 
        // Copy the RGB values into the array.
        System.Runtime.InteropServices.Marshal.Copy(ptr, rgbValues, 0, bytes);
 
        // Set every third value to 255. A 24bpp bitmap will look red.  
        for (int counter = 2; counter < rgbValues.Length; counter += 3)
            rgbValues[counter] = 255;
 
        // Copy the RGB values back to the bitmap
        System.Runtime.InteropServices.Marshal.Copy(rgbValues, 0, ptr, bytes);
 
        // Unlock the bits.
        bmp.UnlockBits(bmpData);
 
        // Draw the modified image.
        e.Graphics.DrawImage(bmp, 0, 150);
 
    }

BufferedGraphicsContext currentContext;
BufferedGraphics myBuffer;
currentContext = BufferedGraphicsManager.Current;
myBuffer = currentContext.Allocate(this.CreateGraphics(),
   this.DisplayRectangle);
myBuffer.Graphics.Draw ......
myBuffer.Render();
myBuffer.Dispose();