How do I determine the true pixel size of my Monitor in .NET?

Question

I want to display an image at \'true size\' in my application. For that I need to know the pixel size of the display.

I know windows display resolution is nominally

Answer 1

You can check by just manually calculating from your screen size

cos(45)*LCD_SCREEN_DIAGONAL_IN_INCHES/sqrt(HORZ_RES^2 + VERT_RES^2)

That would give you the pixel width in inches