HashSet<int> evenNumbers = new HashSet<int>();
HashSet<int> oddNumbers = new HashSet<int>();
for (int i = 0; i < 5; i++)
// Populate numbers with just even numbers.
evenNumbers.Add(i * 2);
// Populate oddNumbers with just odd numbers.
oddNumbers.Add((i * 2) + 1);
Universal Windows Platform Available since 8 .NET Framework Available since 3.5 Portable Class Library Supported in: portable .NET platforms Silverlight Available since 4.0 Windows Phone Silverlight Available since 8.0 Windows Phone Available since 8.1