C# A 1 CSC 298 Introduction to C#

C# A 2 What to expect in this class  Background: knowledge of an object oriented language of the C++, Java, … family. No need to know inheritance.  Outcome: how to program in C# (syntax, inheritance, libraries, using some.NET features: ASP.NET, Web Services, ADO.NET…)  Class organization:  Lectures, lab practice with sample code, homework assignments, tests and quizzes  class web site

C# A 3 Why are we learning C#?  A modern language  object oriented, “portable”, secure  A better C++?  some features of C++ are overly complex (e.g. multiple inheritance)  C# doesn't include any of these  C# features a garbage collector  Open the doors of.NET, the Microsoft initiative.

C# A 4 What is.NET? (1)  Microsoft latest approach to programming  CLR: common language runtime. The virtual machine that executes the.NET application. It understands only Intermediate Language (IL).  A.NET application can be written in any language as long as it can be compiled into IL (C#, VB.NET, J#, FORTRAN, …) .NET framework offers many libraries to make computing across a network easy (use of XML to convey information between machines).

C# A 5 What is.NET? (2)  Distributed computing: Companies can expose their services through the web (Web services)  practically, in a program one can seamlessly use objects (methods + data) that reside on a computer across a network. .NET offers powerful tools to use databases  Microsoft sells many servers (e.g. Biztalk) to help companies publish their services with.NET. We will use IIS.  Old fashioned applications (running only on one computer) can still be developed with.NET.

C# A 6 The Common Language Runtime Source Code (.cs file) C# Compiler IL code (.exe file) Mac ? Unix (e.g. FreeBSD) Windows CLR (JIT compiler JIT: Just in Time)

C# A 7 Lexicon  CLR: Common Language Runtime  IL: Intermediate language  FCL: Framework Class Library, the set of all classes available to the.NET programmer.  CLS: Common Language Specification, the features of the CLR that must be implemented by a language to run on.NET (C# goes beyond the CLS).  CTS: Common Type System, describes how types are defined and how they behave (=rules to define classes…)

C# A 8 Resources  Text: Liberty’s C# - a good reference but not required.  VS.NET framework is available via MSDNAA (a very good deal!)  Enormous amount of resources  within Visual studio documentation  msdn.microsoft.com