This document contains answers to 10 interview questions for Dynamics 365 CE/CRM developers. It discusses OOP concepts in .NET like classes, objects, abstraction, encapsulation, inheritance and polymorphism. It also defines sealed classes, access specifiers, design patterns, namespaces, assemblies, WEB APIs, boxing and unboxing, DLLs and EXEs, signing assemblies, abstract classes and interfaces. Key differences between abstract classes and interfaces are provided. The document is for training purposes to help prepare for Dynamics 365 CE/CRM developer interviews.

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10 C#.NET Interview
Questions for Dynamics
365 CE/CRM Developers
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2. 1.Can you explain about the OOPS concept in Microsoft .NET?
Answer : OOPS is a concept of modern programming language
that allows programmers to organize classes, objects and four
key concepts of OOPs are abstraction, encapsulation,
inheritance and polymorphism.
A class is a blueprint of an object that contains variables for storing data and
functions to perform operations on the data.
Objects are the basic run-time entities of an object oriented system. They may
represent a person, a place or any item that the program must handle.
Abstraction is the process of hiding the working style of an object, and
showing the information of an object in an understandable manner.
Wrapping up a data member and a method together into a single unit (in
other words class) is called Encapsulation.
When a class includes a property of another class it is known as inheritance.
Polymorphism means one name, many forms. One function can be called for
different types of parameters. Two types compile time and run-time
polymorphism.
Refer site for more practice :
https://docs.microsoft.com/en-us/dotnet/csharp/fundamentals/tutorials/oop

3. 2.What is a sealed class and what is the benefit of using it?
Answer : Sealed classes are used to restrict the inheritance feature of
object oriented programming. Once a class is defined as a sealed
class, this class cannot be inherited.
3.Can you explain about access specifiers in C# .NET?
Answer : There are 5 access specifiers in .NET. They are given below.
private: limits the accessibility of a member to within the defined type, for example if a
variable or a function is being created in a ClassA and declared as private then another
ClassB can't access that.
public: has no limits, any members or types defined as public can be accessed within the
class, assembly even outside the assembly. Most DLLs are known to be produced by public
class and members written in a .cs file.
internal: internal plays an important role when you want your class members to be
accessible within the assembly. An assembly is the produced .dll or .exe from your .NET
Language code (C#). Hence, if you have a C# project that has ClassA, ClassB and ClassC then
any internal type and members will become accessible across the classes within the
assembly.
protected: plays a role only when inheritance is used. In other words, any protected type or
member becomes accessible when a child is inherited by the parent. In other cases (when no
inheritance) protected members and types are not visible.
Protected internal: is a combination of protected and internal both. A protected internal will
be accessible within the assembly due to its internal flavor and also via inheritance due to its
protected flavor.

4. 4.Which design pattern you used in your projects in C# .NET?
Answer : The Singleton design pattern is one of the simplest design patterns.
This pattern ensures that the class has only one instance and provides a global
point of access to it. The pattern ensures that only one object of a specific class
is ever created.
5.What is a namespace and assembly in C# .NET?
Answer : A Namespace provides the fundamental unit of logical code
grouping while an assembly provides a fundamental unit of physical code
grouping. Namespace. Namespaces is a logical group of related classes
that can be used by any other language targeting Microsoft . Net
framework .
6.What is a WEB API and how can a WEB API can be accessed in
C# .NET?
Answer : API stands for Application Programming Interface. API is actually some kind of
interface which has a set of functions. These set of functions will allow programmers to
acquire some specific features or the data of an application.
Web API is an API as the name suggests, it can be accessed over the web using the
HTTP protocol. It is a framework that helps you to create and develop HTTP based
RESTFUL services. The web API can be developed by using different technologies such
as java, ASP.NET, etc. Web API is used in either a web server or a web browser. Basically
Web API is a web development concept. It is limited to Web Application’s client-side and
also it does not include a web server or web browser details. If an application is to be
used on a distributed system and to provide services on different devices like laptops,
mobiles, etc then web API services are used. Web API is the enhanced form of the web
application. We can use verbs like Get, Post, Put, Delete etc to interact with the WEB API.

5. 7.Can you explain boxing and unboxing in .NET?
Answer : Boxing is the process of converting a value type to the type
object or to any interface type implemented by this value type. When the
common language runtime (CLR) boxes a value type, it wraps the value
inside a System.Object instance and stores it on the managed heap.
Unboxing extracts the value type from the object. Boxing is implicit;
unboxing is explicit. The concept of boxing and unboxing underlies the C#
unified view of the type system in which a value of any type can be treated
as an object.
8.What is DLL and EXE in .NET?
Answer :
EXE : An exe always runs in its own address space i.e.. It is a separate process.The purpose of an
EXE is to launch a separate application of its own.
DLL : A dll always needs a host exe to run. i.e., it can never run in its own address space. The
purpose of a DLL is to have a collection of methods/classes which can be re-used from some other
application. DLL is Microsoft's implementation of a shared library.
9.What do you understand by signing an assembly in C#?
Answer : A very important reason to sign an assembly is so you
can be sure it is your assembly. Since the private key is yours,
nobody else can sign an assembly with that same key.

6. 10. What is abstract class and interface in C# and differences?
Answer :
Abstract Class Interface
It contains both declaration and
definition parts.
It contains only a declaration part.
Multiple inheritance is not achieved
by abstract class.
Multiple inheritance is achieved by interface.
It contains a constructor. It does not contain a constructor.
It can contain static members. It does not contain static members.
It can contain different types of
access modifiers like public, private,
It only contains a public access modifier
because everything in the interface is public.

7. protected etc.
The performance of an abstract
class is fast.
The performance of the interface is slow
because it requires time to search the actual
method in the corresponding class.
It is used to implement the core
identity of class.
It is used to implement peripheral abilities of
class.
A class can only use one abstract
class.
A class can use multiple interfaces.
If many implementations are of the
same kind and use common
behavior, then it is superior to use
abstract classes.
If many implementations only share methods,
then it is superior to use Interface.
Abstract classes can contain
methods, fields, constants, etc.
Interface can only contain methods .

8. It can be fully, partially or not
implemented.
It should be fully implemented.
Thank You….
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