Class

Question 1

Abstraction in C#

Answer 1

Process of showing only essential information to user

Missing or incomplete implementation

Question 2

Abstract class

Answer 2

base class cannot be used to create objects only can be accessed from inherited objects
cannot be static class
cannot have multiple inheritance
cannot be inherited from structures

Question 3

Abstract method

Answer 3

used only in abstract class without body and can be used by derived/inherited class

Question 4

default access modifier

Answer 4

most restricted acess to that member

class —> internal

Question 5

Indexer

Answer 5

Instance of a class or struct to be indexed as an array

Question 6

Arguments to console application

Answer 6

string array object

Question 7

DDL commands

Answer 7

Create, alter, truncate, drop

Question 8

DML commands

Answer 8

Insert, update, delete,select

Question 9

Default constructor parameters

Answer 9

zero. when no constructor defined

Question 10

Connection pooling

Answer 10

Cache of the connection established so as to reuse when further requests to the database

Question 11

struct / structure

Answer 11

value type – single variable hold related info/record

Question 12

Cardianility

Answer 12

Relationship is one to one, one to many or many to many

Question 13

Inheritance

Answer 13

Allow to define a class in terms or another class from one base class only  Object class is the ultimate base class
struct does not support inheritance

Question 14

Restriction to be a Base class

Answer 14

Only time class cannot be used as base class

1. sealed
2. only private constructors

Question 15

Polymorphism

Answer 15

Class to have multiple implementations with the same name
Static/Compile time polymorphism –>Early Binding
–>overloading
Dynamic/Runtime polymorphism —>Late Binding
–>overridng

Question 16

Access base class virtual member

Answer 16

base.A()

Question 17

shadowing

Answer 17

using 'new' keyword to hide the base class member
[method hiding]

Question 18

nested class

Answer 18

class inside another class to logically group 
--->encapsulation

Question 19

encapsulation

Answer 19

data hiding –>mark all variables as private and use public get set method to access data
or hiding the complexity

Question 20

Garbage collection

Answer 20

The process of releasing memory

Question 21

root

Answer 21

storage location with the reference to an object in managed heap

Question 22

clrMD

Answer 22

Diagnostics. Runtime inspect crash dump and attach to live process and perform all sorts of queries against the runtime

Question 23

MongoDb`

Answer 23

Collection and concepts
Database is a physical container of collections
Database –>Collection of documents/tables
Document–>Row or key value pairs

Question 24

Hexadecimal

Answer 24

0-9 ABCDEF

Question 25

Dynamic variable

Answer 25

Change variable type at run time based on assigned value

Question 26

ExpandoObject

Answer 26

Will let you add objects at runtime

Question 27

dynamic contact=new ExpandoObject()

Answer 27

statically typed object of expandoobject type

Question 28

value types are stored in stack and reference type in heap

Answer 28

int inside a class is stored in heap

Question 29

Objectcache xxx=memoryCache.Default in c#

Answer 29

In MVC controller can have attribute | OutputCache(duration:inseconds)

Question 30

Objectcache xxx=memoryCache.Default in c#

Answer 30

In MVC controller can have attribute Default location: webserver,webbrowser, proxyserver) OutputCache(duration:inseconds)

Question 31

main method is static

Answer 31

callable without creating an instance of a class

Question 32

data type

Answer 32

defines the size of memory to store data

Question 33

javascript -- primitive, composite and special datatypes

Answer 33

primitive - string, boolean and number composite - object array and function special - undefined and null

Question 34

control transfer statement

Answer 34

break; continue

Question 35

``` control structure, repetitive statements While loop Do while loop for loop for each ```

Answer 35

control transfer statement break; continue,goto, throw | Continue statement can be used to go to the next iteration without exiting the loop

Question 36

do while loop executes once before condition reaches

Answer 36

while loop checks the condition before executing

Question 37

Recursion

Answer 37

Calls the method by itself

Question 38

Stackoverflowexception

Answer 38

very deep and unbounded recursion

Question 39

Objects are self contained data structures with events, properties and methods

Answer 39

properities are called smart fields -->data represent Method --->behavior events --->communication

Question 40

constructors

Answer 40

special methods executed when a class is initiated

Question 41

property has 2 accessors

Answer 41

get and set the value of property

Question 42

data fields are declared private

Answer 42

Accessed using public properties

Question 43

Delegates

Answer 43

Encapsulates a method with a special signature

Question 44

Delegates

Answer 44

Encapsulates a method with a special signature | public delegate void RectangleHandler(Rectangle rect)

Question 45

namespace

Answer 45

organize code and use unique class names

Question 46

int, byte, bool, char struct value type

Answer 46

string, class, interface, object, delegate, class are reference types

Question 47

Assembly

Answer 47

Unit of executable code .exe or dll

Question 48

Access modifies namespace - default public | class - internal

Answer 48

no access modifiers allowed for namespace | public and internal for class

Question 49

Abstract method provides a definition, no implementation

Answer 49

Any member of the class is abstract, class itsellf need to be marked as abstract

Question 50

cast an object any of it base types

Answer 50

Cast to its class types or any of the base class types

Question 51

is operator to check casting can be done

Answer 51

as operator returns null is casting failed

Question 52

Icomparable namespace interface

Answer 52

int compareto(Object obj)

Question 53

Interface

Answer 53

Class that implements interface must implement all methods of the interface

Question 54

Class can have multiple interfaces can have only one base clas

Answer 54

Class is a template for object creation Properties are data Methods behavior Events communication

Question 55

Managed code - generated by c# compiler executed by CLR

Answer 55

Unmanaged code compiled to native machine code executed by operating system

Question 56

Unit Testing -- unit of code testing Integration testing ---integration of components testing (component works with external webservice etc) System Testing -- overall testing of system software Acceptance testing --->Alpha testing and Beta testing Regression testing ->make sure nothing is broken with new functionality implementation

Answer 56

Black Box Testing -- Input output testing | White Box Testing --- unit testing ---

Question 57

Stack data structure -- LIFO or FILO | Last in first out

Answer 57

push, pop, peek | heterogenous auto resize

Question 58

``` WCF-- Interface IService and class composite type svc similar to asmx(web service) ```

Answer 58

IService -->OperationContract CompositeType --- >datacontract with datamember communication mode -->tcp, http, named pipelines msmq and peer to peer

Question 59

Boxing is the process of converting a value type too reference type

Answer 59

stack to heap

Question 60

ArrayList can hold all variable types

Answer 60

array list is heterogeneous | Array is homogeneous

Question 61

Queue is a collection first in first out FIFO | circular array with head index and tail

Answer 61

Queue is heterogeneous- different variable types | Enqueue, dequeue, peek and contains

Question 62

Docker -- container application | Docker Service, Kubernates, Service Fabric to work with multiple services in containers

Answer 62

container application are easy for debugging, deployment and testing

Question 63

Linked list is a collection of nodes with each node has a link to the next node in the sequence

Answer 63

Deletion and insertion fast and no limit to the size

Question 64

Sorting --> BubbleSort and QuickSort

Answer 64

Bubblesort --->comparison and swap

Question 65

Database bottlenecks:

Answer 65

abnormal cpu usage | memory leak --- not enough RAM and database started using swap memory

Question 66

WCF-->endpoint | Address, Binding and Contract

Answer 66

Address: uri Binding: HttpBinding or wshttpBinding Contracts: Service, Data and Operation