Image to Icon conversion

I am using following code to convert an image to Icon. Here is my code.

Bitmap Cbitmap=null;
  try
  {
  Cbitmap = new Bitmap("path of local image"); 
  }
  catch(Exception)
  {
  return;
  }
  Cbitmap.MakeTransparent(Color.White);
  System.IntPtr icH = Cbitmap.GetHicon();
  Icon ico = Icon.FromHandle(icH);
 开发者_运维知识库 Cbitmap.Dispose();
  System.IO.FileStream f = new System.IO.FileStream(Path where to save icon"" + "\\image.ico", System.IO.FileMode.OpenOrCreate);
  ico.Save(f);
   f.close();
  ico.dispose();

Now this is converted to Icon successfully but when I try to open it in image viewer it shows preview not available.

Also when to try to open it in project it says

(image.ico is not an icon file)

Your code is fine. It converts a JPG to an Icon. What's the dimensions of your original JPG? If they aren't one of the standard icon sizes, you'll get a strange behavior. If the original JPG is too large, you'll get the error you are seeing.

Some of the more common sizes are 16x16, 24x24, 32x32, 48x48.