1.If you are accessing an image from your local system (or LAN) you should use the next method:
Image.FromStream()
like in the next example:
FileStream fs = new FileStream(imageFileName, FileMode.Open, FileAccess.Read);
Image image = Image.FromStream(fs);
2.If you want to download an image from web by using the image URL, you should use
System.Net.WebRequest
object.