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An Introduction to Visual Studio and VB

An Introduction to Visual Studio.net and VB.net. Tem McGallagher April 2002. .net Framework. Languages CLS Interface Data / XML BCL CLR. Common Language Runtime. BCL Support Threads Type Checking Exception/Error Handling Security Garbage Collection Class Loader. System Namespace.

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An Introduction to Visual Studio and VB

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  1. An Introduction to Visual Studio.net and VB.net Tem McGallagher April 2002

  2. .net Framework • Languages • CLS • Interface • Data / XML • BCL • CLR

  3. Common Language Runtime • BCL Support • Threads • Type Checking • Exception/Error Handling • Security • Garbage Collection • Class Loader

  4. System Namespace • Namespaces are “groups” of classes (similar to Java packages) • The System namespace contains nearly 100 classes that provide the core-runtime • The System namespace has 25 second level namespaces (System.Data, System.IO, System.XML are examples) • The System namespace also contains the classes for base data types

  5. .net IDE

  6. Additions/Deletions to VB.net • Data types have been removed (Variant and Currency data types no longer exist) • Many syntax changes • VB.net is “Type Safe” (You cannot store data of one data type in a variable with a different data type) • System.Object class (is the super class of all objects in .net & VB.net)

  7. OOP in VB.net • VB.net is now truly an object oriented language • VB.net supports both “code” inheritance and visual inheritance (Windows forms) • Methods can be overloaded like with Java class methods • Every component (visual or code) in VB.net is now an Object

  8. ADO.net • No longer contains a Recordset object • The DataSet object is the “heart” of ADO.net • The DataSet object contains a cached version of your data • The DataSet object is disconnected from the server; only when changes are committed or data is refreshed is a connection established • The DataSet object is created by a SqlDataAdapter object, which stores information about the data in an XML schema • All data in ADO.net can be represented, stored, viewed and transmitted in XML

  9. ADO.net Sample Data Flow

  10. ASP.net and Web Services • Key features of ASP.net • Language Independence • Simplified Development • Separation of Code and Content • Support for multiple clients • Enhanced server-side processing

  11. ASP.net and Web Services • Web Services • Replaces DCOM (Distributed COM) in a distributed environment • Utilizes SOAP and XML for data transfer • Are expected to be widely offered by many companies via the Internet for Some applications could be • Exchange rates from banks • Stock quotes • Weather updates • The limits are boundless…any service a company has to offer can be exposed over the Internet with Web services

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