Is this a fastest/simplest way to draw a line to the left and top of the image?
var srcImg = new Bitmap(@"D:\img.png");
var lineSize = 3;
var extImg = new Bitmap(srcImg.Width + lineSize, srcImg.Height + lineSize);
var extGfx = Graphics.FromImage(extImg);
extGfx.DrawImage(srcImg, lineSize, lineSize);
To get this 
from this
