Different between c# and c++ ?

Answer 1

Deja-vu. The exact same question was asked just hours ago.

Answer 2

C++ was designed to allow developers to use all of the existing features of C but provides a number of extensions to support object-oriented programming techniques in an intermediate-level programming language. C# is a complete outlier in this list. Despite it's name, it has far more in common with Java than C or C++.