Different resolution in .NET System.Windows.SystemParameters.PrimaryScreenWidth

If you are getting different resolution on .NET's

System.Windows.SystemParameters.PrimaryScreenWidth

and

System.Windows.SystemParameters.PrimaryScreenHeight

than your current resolution settings, you might wanna check out your viewing settings.

To do so, go to your desktop, right click, and select "Screen resolution".

Then, click on "Make text and other items larger or smaller"

After this, click on the Smaller - 100% radio button.