This document discusses the history and features of the .NET framework. It went through 8 upgrades since its initial release in 2002. Each new version introduced additional APIs and features. The .NET framework includes the Common Language Runtime (CLR) and Framework Class Library (FCL). It allows developers to write code in multiple languages that compiles to Microsoft Intermediate Language (MSIL) and runs on the CLR.

1. Visual C# .Net using
framework 4.5
Eng. Mahmoud Ouf
Lecture 01
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2. Introduction to .Net Framework
• The development of .Net Framework started the late 1990.
• First version was released early 2002.
• Through the 15 years it passes 8 upgrades
• Some of these upgrades was released with new version of Visual
Studio.Net.
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3. Introduction to .Net Framework
Framework version Release date Development tool
1.0 13/02/2002 Visual Studio .Net 2002
1.1 24/04/2003 Visual Studio .Net 2003
2.0 07/11/2005 Visual Studio .Net 2005
3.0 06/11/2006 Visual Studio .Net 2005
3.5 19/11/2007 Visual Studio .Net 2008
4.0 12/04/2010 Visual Studio .Net 2010
4.5 15/08/2012 Visual Studio .Net 2012
4.6 20/07/2015 Visual Studio .Net 2015
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4. Overview of .Net Framework
Common Language Runtime (CLR)
Framework Class Library (FCL)
WinForm ASP.NET ADO.NET
2.0
WPF WCF WF InfoCard
LINQ Entity Framework
Parallel LINQ Task Parallel Library
.Net APIs for store/uwp Task based Async model
3.0
3.5
4.0
4.5
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5. Common Language Runtime (CLR)
Class Loader
MSIL to native
compiler
Code manager
Garbage
collector
Security Engine Debug Engine
Type Checker Exception Manager
Thread support COM Marshaler
Base Class Library (BCL) support
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6. From source code to executable
C# Code
VB.Net Code
Managed C++
Code
C# Compiler
VB.Net
Compiler
Managed C++
Compiler
MSIL, CIL (IL)
PE file (dll, exe)
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7. .Net Framework 1.1
1. Built in support for mobile ASP.Net controls
2. Enables Code Access Security in ASP.Net application
3. Built-in support for ODBC and Oracle Database
4. .Net Compact Framework
5. Support Internet Protocol version 6 (IPv6)
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8. .Net Framework 2.0
1. Full 64-bit support
2. Numerous API changes
3. Microsoft SQL Server integration
4. Additional and improved ASP.Net web controls
5. New personalization features for ASP.Net
6. Partial classes
7. Nullable types
8. Anonymous methods
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9. .Net Framework 3.0
1. Windows Presentation Foundation (WPF)
2. Windows Communication Foundation (WCF)
3. Windows Workflow Foundation (WF)
4. Windows CardSpace
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10. .Net Framework 4.0
1. Parallel Extension to improve support of parallel programming
2. New Visual basic and C# features
3. Include new types
4. Introduced Common Language Runtime (CLR) 4.0
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11. .Net Framework 4.5
1. .Net for Metro Style apps
2. Managed Extensibility Framework (MEF)
3. Core Features
4. ASP .Net
5. Networking
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12. .Net Framework 4.6
1. Just In Time (jit) compiler for 64 bit system
2. WPF and Windows Forms both have been updated for high DPI
scenarios
3. Support for TLS 1.1 and TLS 1.2 has been added to WCF ASP .Net
4. The cryptographic API in .NET Framework 4.6 uses the latest
version of Windows CNG cryptography API.
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13. Structure of C# program
• In C#, an application is a collection of one or more classes.
• The classes for a C# application can be written in more than one file
and multiple classes can be put in one file. One class could be written
in multiple files (partial class).
class HelloWorld
{
public static void Main()
{
System.Console.WriteLine(“Hello, World”);
}
}
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14. Structure of C# program (cont.)
• The entry point to a C# application is the Main() method, which must
be: contained in a class, begin with capital M, and public static.
• public: modifier tells us that the method is accessible by everyone.
• static: means that the method can be called without creating an
instance of the class.
• The .Net Framework is made up of many namespaces, the most
important of which is called System; it contains the classes that most
application uses for interacting with the operating System.
• We can refer to objects in namespace by:
1.prefixing them explicitly with the identifier of namespace
System.Console.WriteLine(“Hello, World”);
2.specifing a namespace by placing a using directive at the beginning
of the application before the first class is defined
using System
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15. Basic Input / Output operation
• Output:
Use the following 2 methods for output:
Console.Write()
Console.WriteLine()
The difference is that WriteLine() append a new line/carriage return to
the end of the output.
To print a constant value:
Console.WriteLine(99);
Console.WriteLine(“Hello, World”);
To print a variable value:
int x = 99;
Console.WriteLine(x);
To print a combination from variable and constant value:
Console.WriteLine(“The Sum of {0} and {1} is {2}”, x, x, x+x);
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16. Basic Input / Output operation
• Input:
Use the following 2 methods for iutput:
Console.Read(), which read single character and return its ASCII
Console.ReadLine(), which read a string
string input = Console.ReadLine();
To read an integer, use the Parse:
string s = Console.ReadLine();
int n = int.Parse(s);
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