Bitmap.HorizontalResolution and Bitmap.VerticalResolution properties

I have one question about how windows read some properties of an Image. When i rightclick on an Image and in Properties window if i goto Details tab then it shows that Image has 200 dpi as Horizontal and Vertical Resolution.

But if i use VB.Net code

objBitmap=New Bitmap(Image.FromFile("C:\Image1.jpg"))

intXResolution=objBitmap.HorizontalResolution

intYResolution=objBitmap.VerticalResolution

then value of intXResolution and intYResolution is 96

How i can get correct Image resolution values in VB.Net?