The following code illustrates the simple way to 
resize an image
 
var 
originalbmp = new Bitmap(Bitmap.FromFile("../../originalImage.png"));
// Load a image to resize
var resizedbmp = new Bitmap(originalbmp 
, originalbmp .Width * 5, originalbmp .Height * 5); 
//  Resize the image into 5 times to 
its actual size
resizedbmp.Save("../../ResizedImage.png",
ImageFormat.Png);
// Save the image 
Now the saved 
image is 5 times bigger in size than the original image