I have 2 object of same class as following in c#.

Myclass obj1=new Myclass(); 
Myclass obj2=null; 
obj2=obj1; 
obj1.Name="abc"; //"abc" will also assign to obj2.Name. 

When I assign obj1.Name="abc", it will also assign to obj2.Name. I want to stop this. I have tried by const, sealed but I am not getting result. Can anybody suggest me how to stop reference of obj1 on obj2?