Intro to C# and .NET
 Jeff Klawiter
 Senior Developer at
 MCPD ASP.NET 2.0, MCTS: WinForms 2.0
 http://www.jeffklawiter.com
 http://nerdery.com/people/jk

C# History
 ECMA 335
 Need for a strong C based language for .NET
 Borrows more syntax from Java and C than
C++
 Static Typed
 Current Version 3.0

.NET Overview
 Standardized as ECMA 334
 Managed memory
 Common Type System
 Languages may expose types differently
 Common Language Runtime
 Multiplelanguages can run together
 Common Intermediate Language used as the
base language
 Currently 20+ languages (including PHP)

.NET Platforms
 Desktop  SQL Server
 Windows Forms  Windows Services
 WPF: Windows  Console Applications
Presentation Foundation
 Shell Scripting with
 Mobile: Compact Powershell
Framework
 Micro Framework
 ASP.NET
 Embedded development
 Web Forms and MVC for sensors, embedded
 Silverlight LCD touch screens, home
automation
 XNA
 2D and 3D video games  COM objects
 Surface  Office Plugins
 Specialized WPF with  WCF
multi touch  Multi Protocol Web
Services
 HTTP, TCP, REST,
SOAP…

Variable Types
 All types inherit from System.Object
 Reference and Value Types
 Reference Types represent a pointer to an object
in memory
 Passed by reference
 Fully mutable
 Value Types represent primitive types
 Passed by value
 int, string, double
 Inherits from System.ValueType

Data Types
byte decimal
sbyte IntPtr No built-in type.
short UIntPtr No built-in type.
int object
long string
ushort
uint
ulong
float
double
bool
char

Collections
 Arrays
 Fixed Size
 Inherits from System.Array
 int[] myArray = new int[] {1, 3, 5, 7, 9};
 Generics Lists
 Strongly typed
 Expanding Size
 Inheritible
 List<Person> people = new List<Person>();
 people.Add(new Person(){ FirstName = “Jeff”,..});

Operators
Operator category Operators
Arithmetic + - * / %
Logical (boolean and bitwise) & | ^ ! ~ && || true false
String concatenation +
Increment, decrement ++ --
Shift << >>
Relational == != < > <= >=
Assignment = += -
= *= /= %= &= |= ^= <<= >>=
Member access .
Indexing []
Cast ()
Conditional ?:
Delegate concatenation and removal + -
Object creation new
Type information as is sizeof typeof

Advanced Features
 Delegates
 Referencable functions
 Lambdas (x=>x.Name.StartsWith(“m”))
 Anonymous Functions
 inline delegates
 Extension Methods
 Add functions to class instance
 Partial Classes
 Split classes across multiple files
 Partial Methods
 Lightweight Events between partial class files.
 Useful with tool generated code
 LINQ: Language Integrated Query
 var result = list.Where(x=>x.Name.StartsWith(“m”))

Demos

References
 Visual C# 2008: The Language
 Best C# book out there
 Covers from novice to professional and beyond
 Also covers visual studio
 MonoDevelop
 http://monodevelop.com/
 Native C# development on Mac OS X and Linux
 Visual C# Express 2008 (Free Visual Studio)
 http://www.microsoft.com/Express/