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I've been fine with Screen.PrimaryScreen.Bounds.Size for some time, but on my Windows7 computer attached to my big-screen TV it is giving me incorrect values. I read elsewhere to try SystemInformation.PrimaryMonitorSize but that gives the same values. When I right click the desktop to get Screen Resolution, it says 1920x1080 . The above two are giving me 1280x720 . I've also tried the WPF versions: var w = System.Windows.SystemParameters.PrimaryScreenWidth; var h = System.Windows.SystemParameters.PrimaryScreenHeight; MessageBox.Show(new Size((int)w, (int)h).ToString()); The display size has been changed via the (right click the desktop) Personalize > Desktop options to be 150% (since the screen is 60" and you sit kind of far away). How to detect this so the value's returned from the above can be adjusted? Note : I've discovered how to get around this with a right-click executable and adjust the compatability to disable DPI virtualization, but I still need a programatic solution so I don't have to have user's adjust this themselves: See - http://msdn.microsoft.com/en-us/library/dd464660(VS.85).aspx#dpi_virtualization

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