Object Oriented --

1.Public Private and Internal or Friend these access modifier can use for class

2.Public Private and Internal or Friend ,Protected and internal protected can we
used with Method

3. no Access modifier Allowed in Interface (Inside interface means for method or
property).for declaring interface u can use public or internal

4.for defining Abstract class u can  use internal or public class .for  abstract
method u can  use only public  access modifier (no  internal,protected) .without
abstract method u can use any Access modifier.

5.Abstract Method Can not be marked as Virtual.and at the time of implementation
of Abstract Method  we have to  use Keywaord Override  .u can not  use "NEW" key
word at the time of implemmentation of Abstract Method

6.if any class have an Abstract Method this class called Abstract Class.

7.Sealed keyword for method can we used with override keyword only.

8. Condition--Class  A is  inheriting in  Class B  and Class  B is inheriting in
Class C There is an condition where  one method(Base class A ) is overriding  in
derived  class(Class B)  now again  I want  to override  this method   again in
derived class(Class C). is it possible  if yes how Answer-Yes with the  same key
Word Override if we want to Stop  to override this class then we can  use Sealed
keyword

9.How to call base class method (which keyword will use )

10.Can u use virtual in base class and NEW in derived class  --- Yes

11.Can u override an method which is hideing the base class method (by using New
KeyWord)--Yes

12.Static Method can not access an instance member.

13.We can convert the integer “i” using “i.ToString()” or “Convert.ToString”  so
what’s the difference.The  basic difference between  them is “Convert”  function
handles  NULLS  while “i.ToString()”does  not  it will  throw  a NULL  reference
exception error. So as good coding practice using “convert” is always safe.

14.Serialization is the process of converting  an object into a stream of  bytes
in order to persist it to memory, a database, or a file. Its main purpose is  to
save the state of an object in order to be able to recreate it when needed.  The
reverse process is called deserialization.

15 Attributes provide  a powerful  method of  associating metadata,  or declarative
information, with code (assemblies,  types, methods, properties, and  so forth).
After an attribute  is associated with  a program entity,  the attribute can  be
queried  at  run  time  by  using  a  technique  called  reflection.

16.Application domains provide a flexible and secure method of isolating running
applications.

Application  domains  are usually  created  and manipulated  by  run-time hosts.
Occasionally, you may  want your application  to programmatically interact  with
your application domains, for example,  to unload a component without  having to
stop your application from running.

Application domains aid  security, separating applications  from each other  and
each other's data.  A single process  can run several  application domains, with
the same  level of  isolation that  would exist  in separate  processes. Running
multiple applications within a single process increases server scalability.