## Using Cryptographic random numbers in Windows Universal applications C#

When building Universal applications the full set of .NET libraries aren't available and one of my favourites for generating Random numbers **System.Security.Cryptography** isnt available anymore. Fortunately this has been replaced with the **Windows.Security.Cryptography** library and although the functions don't correspond with the old library there is an easy way to generate random numbers.

using Windows.Security.Cryptography; public Unit32 RandomNumber(UInt32 min, UInt32 max) { return min+(CryptographicBuffer.GenerateRandomNumber() % (max min)) // find the range of numbers needed (max min) example: 10 - 30 = 20 // then mod the random number with the range example: rnd % 20 // then add it to the minimum value example: 10 + modded rnd }

This function seems to give a pretty even spread of random numbers and is called by:

**UInt32 rnd=RandomNumber(1,59);**

The example above will generate one of the UK Lotto numbers.