i like to show my worked image resize code to help anyone who need this. And if you wanna see more detail, you can check this. hope it can be useful.
private static Image ResizeImage(Image imgToResize, Size size)
Bitmap LoadImage = new Bitmap(@”C:\\1.bmp”);
Size newsize = new size (width, height);
e.g. Size newsize = new size (150, 250);
Image.ResizeImage (@”C:\\1.bmp”, new size(150,250));