Introduction to VB.NET - UP SITF

introduction to
visual basic.net
Patrick Oliveros
Microsoft MVP ASP.NET/IIS

Setting Expectations
▪ Schedule
– 5 Saturdays. 9am - 5pm
▪ Course Requirements
– Daily Exercises
– Midterm Exercise (Day 3)
– Final Exercise (Day 5)
▪ House Rules
– do not hesitate to ask! you are here to learn.
– majority of the things are demo driven, hence less slides!
– do not take calls inside the room. you can take it outside if you need to
take it badly.
– be creative! there are different ways to solve a problem.
– submit requirements to patfreak@outlook.ph

Agenda Overview
▪ Introduction to .NET
▪ Understanding Visual Basic .NET Language
▪ Data Access with .NET
▪ Building Applications
▪ Application Deployment
▪ Future Learning

Hello!
▪ Name
▪ Background
▪ Expectations from the class

Agenda Day 1
▪ Introduction to .NET
– What is .NET?
– Why .NET?
– What you can do with .NET?
▪ Introduction to .NET (Continued)
– Getting familiar with Visual Studio
– Creating your new project
– Fundamentals
▪ Exercise for the Day

Introduction to VB.NET - UP SITF

Microsoft .NET Framework
Common Language Runtime (CLR)
Class Libraries

CLR Features
Class Loader
IL to Native
Compilers
Code
Manager
Garbage
Collector
Security Engine Debug Engine
Type Checker Exception Manager
Thread Support COM Marshaler
Base Class Library Support

Compilation
Before installation
or the first time
each method is
called
Execution
JIT CompilerNative
Code
MSIL
Code
Metadata
Source
Code
Language
Compiler
CLR and Execution

Other .NET
Language
C# VB.NET C++
Compilation
Operating System
Common Language Runtime
Base Class Library
Other Libraries
ASP.NET,Windows Forms, ADO.NET, XML
Framework
Class
Library
(FCL)
.NET
Framework
Execution
.NET Program .NET Library
The Bigger Picture

▪ contains common classes used by all .NET
languages
–Basic data types: int, string, DateTime
–I/O, processes
–Non-.NET Code interoperability
–Others
Base Class Library
Base Class Libraries

▪ BCL plus more useful libraries, also known as
Application Framework Class Libraries
–ASP.NET – Web dev, Web services
–ADO.NET – Data access
–Windows Forms – Windows applications
–XML, others,etc.
Base Class Library
Framework
Class
Library
(FCL)
Other Libraries
ASP.NET,Windows Forms, ADO.NET, XML
Framework Class Libraries

▪ Declare utilization by “Imports” keyword
Imports System
▪ Use fully qualified namespaces
▪ Common FCLS:
–System
–System.Data
–System.IO
–System.Web
Using FCLs

▪ Logical organization
– Code organized in hierarchical namespaces and classes
▪ Unified type system
– Everything is an object, no variants, one string type, all character data is
Unicode
▪ Common design patterns throughout
– Collections, components, events
▪ Object system is built in to CLR, not bolted on
– No additional rules or API to learn
– Everything is derived from “System.Object”
▪ Enables clean OO programming
– Classes and Interfaces, full polymorphism
– Properties, methods, events
– Implementation inheritance
FCL Benefits

demo
let’s create your first program!

▪ Used to repeat statements in a logical
manner
–For Loop
–For Each
–While
–Do While
–Do Until
Loops

▪ Repeats through a range of values
' This is the structure of a For Loop
For <variable> As <type> = <bound From> To <bound
To>
' Do something
Next
Loops – For Loop

▪ This example uses the bound from 0 and bound to 10 in the For Loop statement. Please
remember that the two bounds are inclusive. This means all the numbers in the range,
including 0 and 10, will be reached.
▪ Counter variable is increasing
' This loop goes from 0 to 10.
For value As Integer = 0 To 10
' Exit condition if the value is three.
DoSomething(value)
Next
Loops – For Loop

▪ This example uses the bound from 100 to bound to 10 in the For-loop statement,
decreasing by 10.
▪ Counter variable is decreasing
' This loop goes from 100 to 10.
For value As Integer = 100 To 10 Step -10
' Exit condition if the value is three.
DoSomething(value)
Next
Loops – For Loop

▪ This example uses the nested For Loop
For row As Integer = 0 To 2
For column As Integer = 0 To 2
Console.WriteLine("{0},{1}", row, column)
Next
Next
Loops – For Loop

▪ One of the clearest loop constructs
▪ In the example below, type should match collection type
' This is the structure of a For Each Loop
For Each <variable> As <type> In <TypeCollection>
' Do something
Next
Loops – For Each Loop

Dim Colleges() As String = {“Engineering",
“Architecture", _
“Arts and Sciences", “Medicine"}
' Loop over each element with For Each.
For Each college As String In Colleges
Console.WriteLine(college)
Next
Loops – For Each Loop

Dim Colleges() As String = {“Engineering",
“Architecture", _
“Arts and Sciences", “Medicine"}
' Loop over each element with For
For index As Integer = 0 To Colleges.Length - 1
Console.WriteLine(Colleges(college))
Next
Loops – For Each vs For Loop

Summary – For vs For Each Loop
▪ The For-loop is a core looping construct in the VB.NET language. It
provides a way to explicitly specify the loop bounds. And thus it often
leads to more robust code.
▪ With the for-keyword, fewer careless bugs may occur. Boundaries are
clear, well-defined. Errors are often caused by incorrect loop
boundaries.
▪ By providing the For-Each looping construct, the VB.NET language
simplifies many loops. For-Each loop can reduce bugs in the source
code that might occur due to mismanagement of loop bounds in a
For-loop or other kind of loop.
▪ When possible, it is advisable to employ the For-Each loop for this
reason.

▪ Execute while condition/s is/are true
▪ Stops when condition becomes false
While <condition/s>
' Do something
' Control Condition
End While
Loops – While

▪ Loop continues until i becomes 100.
▪ i is incremented by 10s
Dim i As Integer = 0
While i < 100
' DoSomething(i)
i += 10
End While
Loops – While

▪ Loop continues until v is less than 100 and b > 3.
▪ v is incremented by 10s, b is decremented by 1
Dim v As Integer = 0
Dim b As Integer = 5
While v < 100 AndAlso b > 3
' DoSomething(v)
v += 10
b -= 1
End While
Loops – While (multiple conditions)

▪ Execute loop until condition/s is/are false
▪ Condition should be satisfied first
▪ Option for those who are used with C/C++/C#
Do While <condition/s>
' Do something
' Control Condition
Loop
Loops – Do While

Do While i < 100
' DoSomething(i)
i += 10
Loop
Loops – Do While

▪ Loop continues until v is less than 100 and b > 3.
▪ v is incremented by 10s, b is decremented by 1
Dim v As Integer = 0
Dim b As Integer = 5
Do While v < 100 AndAlso b > 3
' DoSomething(v)
v += 10
b -= 1
Loop
Loops – Do While (multiple conditions)

▪ Same with Do-While, only inversion of condition
▪ Conceptually means “Do-While-Not” syntax
Do Until <condition/s>
' Do something
' Control Condition
Loop
Loops – Do Until

Do Until i < 100
' DoSomething(i)
i -= 10
Loop
Loops – Do Until

Summary – While vs Do While/Until
▪ Be careful with conditions as it may lead to infinite loop. See
Do-While vs Do-Until. It is possible (and common) to use a
termination condition that will never be reached.
▪ The Do-While and Do-Until end with the Loop statement. The
While construct ends with the End While statement.
▪ While-loop construct has a clear syntactic form. The repetition
of the While keyword in the End While statement makes it easier
to read and understand. Other than its syntactic form, it is
equivalent to the Do While construct.

Summary – Day 1
▪ What, why .NET framework
▪ Encounter with Visual Studio
▪ Learning Visual Basic .NET Fundamentals
▪ Creating your first program

Agenda Day 2
– Advanced
▪ ADO.NET
▪ Exercise for the Day

exercise
let’s test your knowledge

Introduction to VB.NET - UP SITF

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