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Introduction to C#

Introduction to C#. By Sam Nasr Nasr Information Systems May 14, 2013. Agenda. Introduction What is .Net? .Net Framework Advantages of .Net/CLR Visual Studio C# Syntax. Introduction. Sam Nasr, MCAD, MCTS, MCT Software Developer since 1995 Nasr Information Systems

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Introduction to C#

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  1. Introduction to C# By Sam NasrNasr Information Systems May 14, 2013

  2. Agenda • Introduction • What is .Net? • .Net Framework • Advantages of .Net/CLR • Visual Studio • C# Syntax

  3. Introduction • Sam Nasr, MCAD, MCTS, MCT • Software Developer since 1995 • Nasr Information Systems • President Cleveland C#/VB.Net User Group • President Cleveland WPF User Group • President .Net Study Group • INETA Mentor – Ohio • Author - Visual Studio Magazine

  4. What is .Net? • New programming methodology • Multiple Languages (VB.Net, C#, J#, etc.) • IL • JIT Compiler • Primary Parts: • .Net Framework • Common Language Runtime (CLR) - JIT Compiler • RTM: v4.5, since 2000

  5. .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.

  6. .Net Framework • Supports Web Standards • HTML • XML • XSLT • SOAP • WSDL (Web Services) • ADO.Net: ActiveX Data Objects, EF • ASP.Net: Active Server Pages • Command Line Tools: ILDASM, ILASM, SN, etc.

  7. 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

  8. 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)

  9. The C# Programming Language • Microsoft proprietary language • OO Language • High-level Language • Programs must be compiled before executed. • Case sensitive • Part of the .NET Framework, used for: • ASP.Net • Console Apps • WF • WCF • WPF • MVC

  10. Elements of a C# Program

  11. Structure of a C# Program

  12. The if-else Statement • The 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.

  13. Demo

  14. Exception Handling • An 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.

  15. Unhandled Exceptions • What happens when the file c:\data.txt is not found in this code?

  16. Handling Exceptions • Place 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.

  17. Exception Handling Sample

  18. The finally Block • The 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.

  19. try-catch-finally Example

  20. Resources • C# 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/

  21. Contact Info sam@nasr.info http://ClevelandDotNet.blogspot.com @SamNasr http://www.linkedin.com/in/samsnasr Thank you for attending!

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