Update Program.cs

test
removed the test line
changed sum function
changed for to linq
Merge branch 'master' of https://github.com/foyzulkarim/OnlineCourse

Conflicts:
	Linq and EF/Samples/LinqAndEntityFramework/LinqAndEntityFramework.ConsoleApp/Program.cs
Merge branch 'master' of https://github.com/foyzulkarim/OnlineCourse
day 5
packages added