Csharp introduction

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C# Tutorial
Introduction to C Sharp

• C# developed by Microsoft and comes after C, C++,
Java. It inherits the properties of C, C++, Java, VB.
• We can say C# is smart and intelligent sister of Java
because it do work smartly in compression to Java.
• The basic concept of C# language are same as C, C++ to
whom you have learnt in C, C++ tutorials.
• Launched in visual studio 2008
• Create a console with visual c# language
• It generates empty program class with main() method

• File extension in c#
• Project file extension: “.csproj” (Means c sharp project)
• Sample application development in C#
• Create a new “console application ” with “visual C#”
language
• It generates an empty “program” class with “main()”
method
• To run an application simply press f5 key on the
keyboard. Then the application will be executed and
output will be displayed

• Importing section:
• This section contain importing statements that are used to
import (including or link) the .NET framework class library
FCL.
• This is most similar to the include statement in c language
• Syntax: using namespace
• Note: if requires namespace is a member of another name
space. We have specify the parent and child namespaces
separate with “.” (dot).
• Ex: using system;
• Using system.io;
• Using system.data;

• Namespace declaration:
• here a user define namespace is to be declared
• Rule : In .NET applications, all the classes
related to the project should be declared in
one namespace.
• Syntax: namespace namespacename{}
• Generally, the namespace name will be same as
“project ” name.

• Class declaration:
• This is to declare the startup class of the
project.
• In every .NET application like console and
windows application. There should be a startup
class name should be “program” you cant
change it
• A startup class is nothing a class, which contain
main() method.
• Syntax: class classname{}

• Class
• Class is a data structure that contains data members
(constants files, events), member function methods,
properties, constructor, destructor, indexers and nested type.
Basically :
• It is a user defined data type.
• It is a reference type.
• In fact class is a tag or template for object.
• Drawback of Class
• Class does not allocate memory to its data members &
member function itself. Basically memory is allocated through
object of a class. Class can’t explore itself means it can not
access its members itself, to access members of a class we use
object of that class.

• Main() method:
• As you know already in c/c++ languages. The
main() method is the starting execution point
of the application
• When the application is executed the main
method will be executed first
• This method contains the main logic of the
application

• Class program
• {
• static void
• Main(string[] args)
• {
• Console.writeline (“hello world!”);
• Console.readline();
• }
• }
• Compiling and running application:
• Compile: click on “build” menu – “build solution”.(or) press ctrl +
shift + B
• Run:
• Click on “debug” menu – “start debugging” . (Or) press f5.

Object:
• Object is representative of the class and is responsible for
memory allocation of its data members and member
functions. An object is a real world entity having attributes
(data type) and behaviors (functions).

• Platform Support
• I've put this last only because it doesn't appear to differentiate
these languages as much as you might think. All these languages
can run on multiple OSes and machine architectures. C is the
most widely-supported, then C++, and finally C# (although C# can
be used on most major platforms thanks to an open source
implementation called Mono).
• My experience of porting C++ programs between Windows and
various Unix flavors was unpleasant. I've never tried porting
anything very complex in C# to Mono, so I can't comment on
that.

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Csharp introduction

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