c# - why is my passed object getting edited -


i pass 'global' object param method. init new instance of object , set equal original, in head have 2 instances of object.

why when change second instance first instance change? never used 'ref'.

namespace mynamespace {     public class myclass     {         private myobjectclass myglobalinstance;      public void mymethod()     {         dosomething(myglobalobject);         }      private string dosomthing(myobjectclass myobjectinstance)     {             myobjectclass newobject = myobjectinstance;         newobject.variable1 = "boo"; //this seems change both newobject.variable1 required  , myobjectinstance.variable1 , calling classes object     }     } }

you copying reference object thats problem. create object same properties use memberwiseclone:

public class globalobject {     public globalobject getcopy()     {         return (globalobject)memberwiseclone();     } }

but have understand difference between shallowcopy , deepcopy

your code this:

namespace mynamespace {     public class myclass     {         private globalobject myglobalinstance;          public void mymethod()         {             dosomthing(myglobalobject);         }          private string dosomthing(globalobject myobjectinstance)         {             globalobject newobject = myobjectinstance.copy();             newobject.variable1 = "boo";         }     } }

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