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By Sam Nasr
Nasr Information Systems
May 14, 2013
AgendaIntroductionWhat is .Net?.Net FrameworkAdvantages of .Net/CLR Visual StudioC# Syntax
IntroductionSam Nasr, MCAD, MCTS, MCTSoftware Developer since 1995Nasr Information SystemsPresident Cleveland C#/VB.Net User GroupPresident Cleveland WPF User GroupPresident .Net Study GroupINETA Mentor – OhioAuthor - Visual Studio Magazine
What is .Net? New programming methodology
Multiple Languages (VB.Net, C#, J#, etc.) IL JIT Compiler
Primary Parts:1. .Net Framework2. Common Language Runtime (CLR)
- JIT Compiler
RTM: v4.5, since 2000
.Net Framework A set of approximately 3500 classes.
Classes are divided into namespaces grouping similar classes.
For organization, each class belongs to only one namespace.
Most classes are lumped into a name space called System System.Data: DB access System.XML: reading/writing XML System.Windows.Forms: Forms manipulation System.Net: network communication.
.Net FrameworkSupports Web Standards
HTMLXMLXSLTSOAPWSDL (Web Services)
ADO.Net: ActiveX Data Objects, EF
ASP.Net: Active Server Pages
Command Line Tools: ILDASM, ILASM, SN, etc.
Advantages of .Net Write once, run everywhere with .Net FW
Multiple programming languages (20+)
Coding Reduction Controls Template projects IIS/Cassini support
Ease of Deployment
Security Features
Visual Studio IDE for development
Templates for: Console app, Web Service, Win Service, ASP.Net, Class Libraries
Security tools
VS Web Server (Cassini)
Application Testing
Team Suite for project management
Express versions (free)
The C# Programming LanguageMicrosoft proprietary languageOO LanguageHigh-level LanguagePrograms must be compiled before executed.Case sensitivePart of the .NET Framework, used for:
ASP.Net Console Apps WF WCF WPF MVC
Elements of a C# Program
Data Types Types of data in a program. Common data types are int (integers), char (single character value), float (floating point values).
Variables Provides temporary storage during program execution.int number = 10;
Constants Data fields whose value cannot be modified.const int i = 10;
Arrays A collection of items in which each item can be accessed by a unique index.int[] numbers = { 1, 2, 3, 4, 5 };
Operators Symbols that specify which operation to perform on operands before returning a result.
Methods Methods are code blocks containing a series of statements. Methods can receive input via arguments and can return a value to the caller.
Structure of a C# Program
The if-else StatementThe if-else statement allows your program to perform one
action if the Boolean expression evaluates to true and a different action if the Boolean expression evaluates to false.
Demo
Exception HandlingAn exception is an unexpected error condition that occurs
during program execution.When exception occurs, the runtime creates an exception
object and “throws” it.Unless you “catch” the exception, the program execution
will terminate.Exceptions are an object of the System.Exception class or
one of its derived classes.Example: DivideByZeroException exception object is
thrown when the program attempts to divide by zero.Example: FileNotFoundException exception object is
throws when the program cannot find a given file.
Unhandled ExceptionsWhat happens when the file c:\data.txt is not
found in this code?
Handling ExceptionsPlace the code that throws the exceptions
inside a try block. Place the code that handles an exception
inside a catch block.You can have more than one catch blocks for
each try block. Each catch block handles a specific exception type.
A try block must have at least a catch block or a finally block associated with it.
Exception Handling Sample
The finally BlockThe finally block is used in association with the
try block.The finally block is always executed regardless
of whether an exception is thrown.The finally block is often used to write clean-up
code.
try-catch-finally Example
ResourcesC# Jumpstart Training:
https://www.microsoftvirtualacademy.com/training-courses/developer-training-with-programming-in-c
Community Megaphone: http://www.communitymegaphone.com/
C#/VB.Net Special Interest Group: http://www.ClevelandDotNet.info/
Cleveland WPF User Group: http://www.clevelandwpf.info/
.Net Study Group: http://www.meetup.com/net-study-Group/
Contact [email protected]
http://ClevelandDotNet.blogspot.com
@SamNasr
http://www.linkedin.com/in/samsnasr
Thank you for attending!
