Learn VB.NET at ASIT
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The document provides an overview of VB .NET, covering topics such as subroutines, functions, exception handling, and file management. It highlights VB .NET's features, including its object-oriented nature and integration with the .NET framework. Additionally, it mentions training opportunities available in classrooms and online.
Learn VB.NET at ASIT
- 1. VB .NET
- 2. Topics • Sub routines and Functions • Constructor and Destructor • Windows Application • Collections • File Handling • Exception Handling • Data base connectivity • Introduction to VB .Net • Creating VB .Net Project in VS 2005 • Data types and Operators in VB .Net • String Functions • Conditions (If Else, Select Case) • Loops (Do While, Do Until, For) • Classes, Objects
- 3. Introduction • VB .Net is developed by Microsoft • It is Visual Basic for .Net Platform • Ancestor of VB .Net is BASIC • In 1991, Microsoft added visual components to BASIC and created Visual Basic • After the development of .Net, VB was added with more set of controls and components and thus evolved a new language VB .Net
- 4. Features of VB .Net • Object Oriented Language • We can drag controls from the tool bar and drop them on the form and write code for the controls • Runs on the CLR (Common Language Runtime) • Release of unused objects taken care by the CLR
- 5. Data types and Operators in VB .Net • Data types Integer, string, single, double, boolean, char • Operators Arithmetic (+,-,*,/,,Mod) Logical (Or, And) Relational (=,<>,<,<=,>,>=)
- 6. String Functions • Len(str) – Length of the string str • Str.Replace(“old”,”New”) – Replaces Old with New in the string Str • Str.Insert(pos,”string”) – Inserts the string specified at the position pos in the string Str • Trim(str) – Removes the leading and trailing spaces in the string str
- 7. Programming Concepts If Else Select Case For Loop Do While Loop Do Until Loop Class Object Subroutines and Functions Continued……
- 8. Constructor Destructor Collections Array List Sorted List Hash Table Stack Queue
- 9. Exception Handling • Exception is Run time error • It is not known at the compile time • Examples of exceptions Divide by zero Accessing non existing portion of memory Memory overflow due to looping • In VB .Net, exception is handled via Try Catch Mechanism
- 10. Try Catch Finally Try Suspicious code that may throw an exception to be written here Catch ex As Exception What to be done if exception occurs to be written here Finally Optional portion which will be executed irrespective of the happening of exception to be written here. Can contain code for releasing unnecessary space
- 11. File Handling • In the System Namespace, the IO class has several subclasses for file handling, text processing etc • Classes File, Directory are used for creating, deleting file or folders and also has methods to play with them • Class FileStream is used for creating and manipulating files • Open the file using FileStream class. This makes use of FileMode and FileAccess enumeration to specify how to open a file (for creating a new file or opening an existing file) and whether the file is read only or write only or read write • Associate a reader for the stream • Read the file and do the manipulations
- 12. Operations on a file • Create • Move • Copy • Replace • Read • Write • Delete
- 13. We also provide classroom and online training classes For More Details www.asit.amcsquare.com Wise Machines India Pvt Ltd #360, Sri Sai Padma Arcade, Varthur Main Road, Ramagondanahalli, Whitefiled ,Bangalore – 560066. We also having Branches in Hyderabad & Chennai