Read Write Pixel - Class

using System.Drawing.Imaging;

Bitmap bmp = new Bitmap(picturebox1.Image);

//read
Color c = bmp.GetPixel(1, 1);

//write
bmp.SetPixel(2, 2, c);

private void GetPixel_Example(PaintEventArgs e)
{

    // Create a Bitmap object from an image file.
    Bitmap myBitmap = new Bitmap("Grapes.jpg");

    // Get the color of a pixel within myBitmap.
    Color pixelColor = myBitmap.GetPixel(50, 50);

    // Fill a rectangle with pixelColor.
    SolidBrush pixelBrush = new SolidBrush(pixelColor);
    e.Graphics.FillRectangle(pixelBrush, 0, 0, 100, 100);
}