.NET provides a common language runtime and framework that supports multiple programming languages. It allows developers to create multi-language solutions that take advantage of features like integrated debugging. The languages supported include Visual Basic, C++, C#, J#, and more. Each language provides access to the .NET framework while enhancing productivity and adding modern language features specific to that language.

1. .NET Language Supports

2. VBC++C#J#…Common Language SpecificationASP .NETWeb Forms Web ServicesMobile Internet ToolkitWindowsFormsADO .NET and XMLBase Class Library.NET Language Support Visual Studio .NETCommon Language RuntimeOperating System

3. .NET Language Support OverviewVBC++C#J#COBOL…Web ServicesUser InterfaceASP.NETADO.NET: Data and XMLBase FrameworkCommon Language Runtime

4. IDE & CLRIntegrated Development EnvironmentSingle Solution Explorer, Toolbox, and Debugger IntelliSense® statement completion and squiggliesCreate multi-language solutionsCommon Language RuntimeMicrosoft: Visual Basic®, C#, C++, J#, JScript®3rd Party: APL, Cobol, Component Pascal, Eiffel, Fortran, Haskell, Mercury, Oberon, Oz, Perl, Python, RPG, Scheme, Smalltalk, Standard ML

5. Increased ProductivitySimplifies mixed-language developmentRAD across the boardDesktop WebServer MobileEnd-to-end debugging support across Languages ProjectsProcessesMachines

6. Language EnhancementsVisual Basic .NETFully object oriented, supports free threadingStructured exception handlingVisual C# .NETIncreased productivity for C++ developer Component-oriented, type-safeVisual C++ .NETAttribute based programmingManaged Extensions for C++Visual J# .NETJava language for .NET Platform

7. Visual Basic .NET

8. Visual Basic .NET OverviewModern, Powerful, True OOPInheritance, overloading, shadowing, delegates, attributes, hierarchical name spacesRobust Strict type checking, initialize variables at declaration, variable declaration types fixed Consistent Single assignment operator, parenthesis use simplifiedSimplified Legacy constructs removed

9. Classes & InheritanceInheritance supportedDerive from a single base classImplicitly inherits from System.ObjectDeclarable classesOverridingNew implementation for base class methodOverrides keywordMyBase refers base classMe refers current classOverloadingMultiple versions of a class memberBased on parameter types

10. Demo 1: Visual Studio .NET Integrated Development Environment

11. Visual C# .NET

12. Visual C# .NET OverviewStrong C++ heritageImmediately familiar to C++ and Java developersAllows C-style memory management and pointersFirst component-oriented language in C familyProperties, methods, indexers, delegates, eventsDesign-time and runtime attributesEnables one-stop programmingNo header files, IDLEmbeddable in ASP .NET

13. Component-OrientedWhat defines a component? Properties, methods, events Design-time and runtime information Integrated help and documentationFirst class support in C# Not naming patterns, adapters, etc. Not external filesEasy to build and consume

14. for I = 1 To 10‘ for loopNext Ifor (i=1;i<11;i++) {// for loop}Comparison to Visual BasicSyntactic DifferencesVisual Basic is NOT case sensitiveIn C# but not in Visual BasicPointers, shift operators, inline documentationOverloaded operators, unsigned integersIn Visual Basic but not in C#Select Case, Interface implementationDynamic arrays, modules, optional parameters

15. Visual C++ .NET

16. Visual C++ .NET Compiler & LanguageOptimizationsWhole Program OptimizationOptimized inline assembly integrationLoop unrolling heuristicsRuntime checksBuffer OverrunStack CorruptionShortened ConvertsAttributes – domain specific programmingRadically simplifies COM+ and IDLIntegrated with .NET Framework attributes model

17. Managed ExtensionsFull access to the .NET Framework from C++

18. It’s still C++

19. All enhancements are compatible extensions

20. Nothing from C++ has been changed or removed

21. Enables incremental migration to .NET

22. Existing code can be recompiled as IL

23. Mix managed code within existing applications

24. Power to drop “to the metal” when neededNative LibrariesMFC/ATLImproved MFC/ATL integrationIntegrated Web Service clientWindows® XP, GDI+, Crypto, NT Security, Perfmon, AccessibilityATL ServerATL framework for Web Services and Web applicationsStencil-based UI generation with integrated XML/HTML designerEnhanced STLBetter conformance and error messagesSignificantly improved documentation