How to get monitor width and height in C# windows app?

Question

Hi,

 

My machine in windows-7 & Screen resolution is (1366 * 768) Highly recommended.

 

float height = SystemInformation.VirtualScreen.Height;

float width = SystemInformation.VirtualScreen.Width;

double diagonal = Math.Sqrt(width * width + height * height);  

 

The above code I have used to get width and height of the screen to calculate diagonal in windows application. But the problem here is when I change the resolution width and height also gets change. So I need a piece of code that should read height and weight to calculate diagonal size. 

 

Please post solution for this post.

Thanks in Advance.