Object Creation

In my unmanaged there is code i n this way Class1 c1= new Class1(); // Class1 is one object and creating a instance of it\ Class1 c2= new Class2();// Class2 is another object a c2 is its instance string s=c2.f1().GetDataCollection(); //GetDatacolection gets some object name c1=new s; // this is creating a object dynamically Can we achieve this concept in C#? Please send me some code snippets Thank you