visual studio 2010 - Parameterless constructor in c# -

i writing unit test existing class "person" in visual studio 2012 , class has constructor 2 parameters , business logic.

testmethod()         public void verifypersontest() {     //using privateobject class     privateobject privatehelperobject = new privateobject(typeof(person));      //some business logic                              } 

when try run above test got exception "system.missingmethodexception {"no parameterless constructor defined object."}".so have added parameterless constructor person class , able run test without issue.

i have following questions

1)as have added parameterless constructor person class ,will break existing functionality of person class?

2) privateobject privatehelperobject = new privateobject(typeof(person));

the above statement invokes parameterless constructor of person class.suppose if want invoke constructor 2 parameters,how can write above statement?

you instantiate person object yourself:

var myperson = ...; var privatehelperobject = new privateobject(myperson);