Question

Suppose i am having a class

Class ABC
 {
  public string Method1()
  {
   return "a";
  }
  public string Method2()
  {
   return "b";
  }
  public string Method3()
  {
   return "c";
  }
 }

and Now i am calling this methods in two ways like :

ABC obj=new ABC();
Response.Write(obj.Method1());
Response.Write(obj.Method2());

Another way

Response.Write(new ABC().Method1());
Response.Write(new ABC().Method2());

The output will be same for above two method .

Can some please help me understanding the difference between obj.Method1() and new ABC().Method1()

Thanks in Advance..

Answer 1

obj and new ABC() are separate instances. In your example the output is the same because there is no instance-level data to show.

Try this to see the difference:

Class ABC
 {

  public string Name = "default"; 

  public string Method1()
  {
   return "a";
  }
 }

then use the code below to show the difference with instance-level data:

ABC obj=new ABC();
obj.Name = "NewObject";
Response.Write(obj.Method1());
Response.Write(obj.Name);

Response.Write(new ABC().Method1());
Response.Write(new ABC().Name);