ASP.NET Session 3

Objectives
1.Understanding of the language basics to facilitate
development.
2.Basic Object Oriented Programming concepts and
C# Programming Structure.
3. Language fundamentals
4.Doing our first C# Program.
5. Hands on knowledge in Visual Studio.

Introduction
• C# (pronounced “See Sharp”) is a simple, modern,
object-oriented programming language.
• It was made by Microsoft Corporation, more
precisely by Anders Hejlsberg.
• It was created to use all capacities of .NET
platform. The first version appeared in 2001, last
update appeared in 2010 with the C# 4.0.
• C# has its roots in the C family of languages and
will be immediately familiar to C, C++, and Java
programmers.

Fundamentals of Object Oriented
Programming
• OOPs design methodology is different from
traditional language like BASIC, Pascal, C etc.
Those are called the Procedural Language.
• In OOP, the emphasis is on Data and not on
procedures.
Class
• In OOP, A class describes all the attributes of
objects,as well as the methods that implement the
behavior of member object.
• A class is only a specification of a data type.
• A class is like a blue print of the Object.

Programming(Contd..)
Objects
• They are instance of classes.
• Objects are the central idea behind OOP
technology.
• An object is a bundle of variables and related
methods.
• When an object is created memory allocation
takes place.

Programming(Contd..)
Three principles of object oriented programming
1.Encapsulation
• The ability to hide the internals details of an object
from the outside world.
2.Inheritance
• Hierarchy is used to define more specialized classes
based on a preexisting generalized class.
3.Polymorphism
• The ability to extend functionality.

Abstract Class:
 We can not create a object of abstract class.
 It only allows other classes to inherit from it but can't
be instantiated.
 In C# we use Abstract Keyword.
Interface
 An interface is not a class, is entity.
 An interface has no implementation; it only has the
signature.
 Just the definition of the methods without the body.

Partial Class Example
• public partial class MyClass
• {
• partial void DoSomethingElse();
• public void DoSomething()
• {
Console.WriteLine("DoSomething() execution
started.");
• DoSomethingElse();
• Console.WriteLine("DoSomething() execution
finished.");

• Console.ReadKey();
• }
• }
• public partial class MyClass
• {
• partial void DoSomethingElse()
• {
• Console.WriteLine("DoSomethingElse()
called.");
• }
• }

• class Program
• {
•
• static void Main(string[] args)
• {
• MyClass mm = new MyClass();
• mm.DoSomething();
• }
• }
• }

OutPut
• DoSomething() execution started.
• DoSomethingElse() called.
• DoSomething() execution finished.

C# Language Fundamentals
• Garbage collection automatically reclaims
memory occupied by unused objects.
• Exception handling provides a structured and
extensible approach to error detection and
recovery.
• Ex: try, catch & finally
• C# is case-sensitive.

C# Console Application
• Console applications in C# have exactly the same purpose
as regular console applications: to provide a command line
interface with the user.
• Console applications have three main input streams:
standard in, standard out and standard error.
• “Hello World” Program using C#:
using System;
class Hello
{
static void Main(String[] args)
{
Console.WriteLine("Hello, World");
}
}

C# Console Application in Visual
Studio

C# Console Application(Contd..)
• The "System.Console" class:- The main element
in a console application is the "System.Console"
class. It contains all methods needed to control the
three streams of data.
• "ReadLine" method:- The main ways of
acquiring data from the standard input stream.
"ReadLine" reads a whole line of characters from
the buffer up to the point where the first end line
character ("n") is found. It outputs its data as
"string“.

Working with Visual Studio
• Microsoft Visual Studio is an Integrated Development
Environment (IDE) from Microsoft.
• It can be used to develop Console applications along
with Windows Forms applications, web sites, web
applications, and web services.
• Features :
1. Code editor
2. Debugger
3. Designer
4. Other Tools

Code editor
• Visual Studio includes a code editor that
supports syntax highlighting and code
completion using IntelliSense for not only
variables, functions and methods but also
language constructs like loops and queries.
• Autocomplete suggestions are popped up in a
modeless list box, overlaid on top of the code
editor.

Debugger
• Visual Studio includes a debugger that works both as a
source-level debugger and as a machine-level debugger.
• It works with both managed code as well as native code and
can be used for debugging applications written in any
language supported by Visual Studio.
• The debugger allows setting breakpoints (which allow
execution to be stopped temporarily at a certain position).
• The debugger supports Edit and Continue, i.e., it allows
code to be edited as it is being debugged (32 bit only; not
supported in 64 bit).
• When debugging, if the mouse pointer hovers over any
variable, its current value is displayed in a tooltip ("data
tooltips"), where it can also be modified if desired.

Designer
• Visual Studio includes a host of visual
designers to aid in the development of
applications. These tools include:
1. Windows Forms Designer
2. Web designer/development
3. Class designer
4. Data designer

Windows Forms Designer
• The Windows Forms designer is used to build GUI
applications using Windows Forms.
• It includes a palette of UI widgets and controls (including
buttons, progress bars, labels, layout containers and other
controls) that can be dragged and dropped on a form
surface.
• Layout can be controlled by housing the controls inside
other containers or locking them to the side of the form.
• Controls that display data (like textbox, list box, grid view,
etc.) can be data-bound to data sources like databases or
queries.
• The designer generates either C# or VB.NET code for the
application.

Web designer/development
• Visual Studio also includes a web-site editor
and designer that allows web pages to be
authored by dragging and dropping Web
controls.
• It is used for developing ASP.NET
applications and supports HTML, CSS and
JavaScript.
• It uses a code-behind model to link with
ASP.NET code.

Class designer
• The Class Designer is used to author and edit
the classes.
• The Class Designer can generate C# and
VB.NET code outlines for the classes and
methods.
• It can also generate class diagrams from hand-
written classes.

Data designer
• The data designer can be used to graphically
edit typed database tables, primary and foreign
keys and constraints.
• It can also be used to design queries from the
graphical view.

Polymorphism in .Net
• What is Polymorphism?
Polymorphism means same operation may
behave differently on different classes.
Example of Compile Time Polymorphism:
Method Overloading
Example of Run Time Polymorphism: Method
Overriding

Example of Compile Time
Polymorphism
Method Overloading
- Method with same name but with different arguments is
called method overloading.
- Method Overloading forms compile-time polymorphism.
- Example of Method Overloading:
class A1
{
void hello()
{ Console.WriteLine(“Hello”); }
void hello(string s)
{ Console.WriteLine(“Hello {0}”,s); }
}

Run Time Polymorphism
• Method Overriding
- Method overriding occurs when child class declares
a method that has the same type arguments as a
method declared by one of its superclass.
- Method overriding forms Run-time polymorphism.
- Note: By default functions are not virtual in C# and
so you need to write “virtual” explicitly. While by
default in Java each function are virtual.
- Example of Method Overriding:

• Class parent
{
virtual void hello()
{ Console.WriteLine(“Hello from Parent”); }
}
Class child : parent
{
override void hello()
{ Console.WriteLine(“Hello from Child”); }
}
static void main()
{
parent objParent = new child();
objParent.hello();
}
//Output
Hello from Child.
•

Summery
Language basics to facilitate development.
Basic Object Oriented Programming concepts
C# Programming Structure.
Language fundamentals
Doing our first C# Program.
Hands on knowledge in Visual Studio.

ASP.NET Session 3

Recommended

More Related Content

What's hot (20)

Viewers also liked (16)

Similar to ASP.NET Session 3 (20)

More from Sisir Ghosh (18)

Recently uploaded (20)

ASP.NET Session 3

Editor's Notes