1. Foundations of .Net Programming with C#
Haiming Chen
Department of Computer Science
Ningbo University
Fall Semester ,
Course 106F22A01

2. Operating System (MS Windows)
.Net Framework
Visual Studio .NET
Common Language Runtime (CLR)
Base Class Library:
IO, Drawing, Threading
Data and XML
XML Web
services
Windows Forms
Web Forms
Common Language Specification (CLS) VB
C++ C# …
JScript
Operating System (MS Windows)
.Net Framework Class Library (FCL)
Just In Time compilation (JIT)

3. CLS
Define common rules that should be obeyed by all the .Net programming languages (i.e. C#, VB)
Develop applications that can inter-operate with applications with different programming languages
CTS (Common Type System)
Standard data type
Rule sets

4. Program w/o the .Net Framework
Results
C++ VB
Compiler
Executable code R U N T I M E

5. Program with the .Net Framework
IL_0000: nop
IL_0001: call
IL_0006: nop
IL_0007: ldc.i4.0
IL_0008: call
IL_000d: nop
IL_000e: ldnull
IL_000f: ldftn
IL_0015: newobj
IL_001a: call
IL_001f: nop
IL_0020: newobj
IL_0025: call
IL_002a: nop
IL_002b: newobj
IL_0030: throw
Results
C++ VB
Compiler
Microsoft
Intermediate Language
(MSIL) +
Meta Data
CLR

6. Program with the .Net Framework
1st Compiling
.NET source code
CLR
Native code
MSIL
Result
Compiler
Support inter-operation between programs written with different languages
Need CLR to translate MSIL to codes running on a specific CPU (e.g. Intel, AMD, Qualcomm)
IL is similar with the JAVA byte code.
irrelevant to instruction sets (e.g. X86, ARM, MIPS) of CPU

7. Program with the .Net Framework
2nd Compiling
CLR
.NET source code
Native code
MSIL
Result
Compiler
Memory management
Together with CLS, to realize cross-language integration
Ease design of components and applications, and support cross-language interaction
JIT compiler：compile once, run on any number of operating systems with the .Net framework

8. C# language
Object oriented programming language, fully utilizing the advantage of .Net Framework, for developing classic windows desktop software, web service applications
Different from C/C++, which is mainly used in developing system software interacting with hardware frequently
C# can also make use of functions provided by the operating system
C# combines advantages of VB in fast developing software and C/C++ in power of operating low layer of system

9. Namespace Like package in JAVA
.Net Programming with C#
Namespace
Like package in JAVA
To organize related classes into a container
To avoid conflict of naming classes
Operator to use name space: using
namespace a1 {
class A … }
namespace a2 {
class A … }
using a1;
using a2;
a1.A
a2.A

10. Common used namespaces
.Net Programming with C#
Common used namespaces
Namespace
Description
System.Drawing
Process graphs, draw figures and print
System.Data
Operate data in database (ADO.NET)
System.IO
Operate file and data streaming
System.Windows
System.Reflection
System.Threading
System.Collections

11. Hello World
Project->Properties
Build->Debug/Release

12. Quiz 1 Please describe the procedure to run a C# source program
What’s the use of CLS and CLR in .Net Framework?
How does C# organize classes?
How to create a project and run it in VS?