It is used to provide relevant information and used to hide the relevant information from the user.
To achieve: Class or structures should be used
Whenever an entry can change its definition based on the values of the argument supplied for that entity then it is said to be supporting polymorphism.
To achieve: The overloading concept is used to achieve polymorphism.
Note:
If any language supports the above 3 features then it is said to be an object-based programming language.
Ex: VB 6.0
It is used to reuse or to redefine the existing class definition.
Note:
If any language supports the above all features then it is said to an object-oriented programming language.
Ex: VB.Net
It is used to set or get the values from the private or protected members of the class
Syntax:
Public [Read only Write only] property propertyName () as data type
Set (by val value as data type) [property should always be public]
Variable = value
End set
Get
Return variable
End get
End propertyValue in the above syntax is a keyword which maintains the value assigned by the user at the runtime.
Product [class]
= product Id
= product Name
= price
Sub new (Pid, Pname, Price) [we can’t change pid, pname, price can be fixed or re written]
Read Only
Product Id
Product Name
Read & write only
Price
Open new app
‘‘Demo on properties
Imports system
Module property ‘‘Demo
Class Product
Private - Product Id As integer
Private – Product Name As a string
Private – Price As Double
Sub new (By vale pid As integer, By val pname As string, By val price As Double)
Me._Product Id = Pid
Me._Product Name = Pname
Me._Price = Price
End sub
Public Read-only property Product Id as an integer
Get
Return Me._Product Id
End Get
End property
Public Read-only property Product Name as String
Get
Return Me._Product Name
End Get
End property
Public Read-only property Price as Double
Get
Return Me._Price
End Get
End property
End class
Class ShowRoom
Public shared sub main ()
Dim tv As the new product (101, “LG Golden Eye”,13500)
tv. As productName = “Sekhar Diamond Eye” error since it
is read only
tv.price = 12000
Console.WriteLine (“Product Id: {0}”, tv.Product Id)
Console.WriteLine (“Product Name: {0}”, tv.ProductName)
Console.WriteLine (“Price: {0}”, tv.Price)
End sub
End class
Imports system
Module Property ‘‘Demo2
Class Product
Private – First Name As String
Private – Last Name As String
Public property First Name As String
Set (By val value As string)
Me._First Name = value
End set
Get
Return Me._First Name
End Get
End property
Public property Last Name As String
Set (By val value As string)
Me._Last Name = value
End set
Get
Return Me._Last Name
End Get
End property
End class
Sub main ()
Dim uname As New Name
uname.FirstName = “Shekar”
uname.LastName = “Srinivas”
Console.WriteLine (“user name: {0} {1}”,
uname.FirstName, uname.LastName)
End sub
Execute | Inclined to build a profession as VB.Net Developer? Then here is the blog post on, explore VB.Net Training |
It is used to define a read and write property implicitly.
Syntax:
Public property PropertyName As Datatype
Note:
It is a feature introduced from VB.Net 4.0
Auto Implicit property ‘‘Demo.vb
Imports system
Module Property ‘‘Demo2
Class Name
Public property First Name As String
Public property Last Name As String
End class
Sub main ()
Dim uname As New Name
uname.FirstName = “Shekar”
uname.LastName = “Srinivas”
Console.WriteLine (“user name: {0} {1}”,
uname.FirstName, uname.LastName)
End sub
End ModuleThe above two programs are the same and give the same output Sekhar Srinivas. In the first program, we write the code manually, and in the second program code is generated by technology (.Net). The second program works in only VB.Net 4.0. In the 1st program, the data which is private has been published for use by means of “Property”. In the second program declaring of data types in private & published for using these by auto implicit keyword in a single line.
C: Start notepad f.vb (first program)
C: vbc f.vb; o/p shekar srinivas
C: f.vb
C: Start notepad s.vb
C: vbc s.vb; C: s.vb
To know code after execution is C: Mdasm f.exe
It is used to modulate the flow of the application.
Advantage:
The thing we can make using procedures can also make with functions and vice versa. So in C, C++, Java we have only functions they feel functions & procedures are the same. But VB.Net people feel that procedures and functions are different.
VB.Net supports strict English grammar and literal keywords like any other language. Procedure outcome of procedures and functions the thing we use is the same but we select based on our requirements.
It is a set of instructions that are used to perform a specific action or task.
Syntax:
[Modifiers] sub methodName ([arginfo]) ‘Statement(s)’ - - - - - - - - - - - - End sub
It is a set of instructions that are used to perform calculations, expression value, and used to return a value.
Syntax:
[Modifier] function MethodName ([arginfo]) as Data type
‘Statement(s)’
- - - - -
- - - - - -
return < Return value>
End function
In VB.Net main () method is a procedure but not function [so in VB.Net main () can’t return a value] constructor is also a procedure but not function.
Where argnfo in the above syntax is [By val|By ref] argName as Data type
It is used to pass the value from the caller to the called.
Note:
The default mode of passing the information in VB.Net is Byval
It is used to pass the reference of the variable from the caller to the called.
Note:
If any modifications are performed at the called then those changes will be reflected at the caller.
Observation:
Call By Value
It is used to define a parameter as an optional parameter.
Note:
Optional parameters should always be defined as the last parameters within the method.
Note:
Optional parameters should be assigned with default values.
It is used to define a parameter present within the method as an array where the array is a collection of related data type values.
Note:
‘‘Demo on Methods
Import system
Module Methods ‘‘Demo
Class Calculator
Public Function Add (By Val a As Integer, By Val b As Integer) As Integer
Return a + b
End Function
Public Function Add (By Val a As Integer, By Val b As Integer) As Integer = 0)
Return Function
End Function
Public Function Add (By Val Param Array nos () As Integer) As Integer
Dim total As Integer = 0
For Each no As Integer In nos
Total = total + no
Next
Return total
End Function
Public sub Display (By Val result As Integer)
Console.WriteLine (Result: {0}, result)
End sub
End class
Sub main ()
Dim calc As New Calculator
Calc.Display (calc.Add (10, 20))
Calc.Display (calc.Add (1, 2, 3, 4, 5, 6, 7, 8, 9))
End sub
End Module
Execute Whenever more than one method with the same name and different argument information is used then it is said to be method Overloading. [If we want to determine more variables then we can use param arrays if we don’t know how many arguments are passing we can use For Each instead of for Loop]
It is used to reuse or redefine the existing class definition
Note:
.Net supports only single inheritance
| Check out our tutorial on the VB.NET Tutorial |
A class Derived class inherits Base class member(s) - - - - - - - - End class The member’s defined using public, protected; friend and protected friend modifiers at the base class can be accessed directly from the derived class. The ex’s are customized applications purely for understanding the concept.
‘‘Demo on Inheritance
Imports system
Module Inheritance ‘‘Demo
Class Parents
Protected Friend sub-MyProperty ( )
Console.WriteLine (“Use property for business”)
End sub
End class
(Class children inherits parents)
Class Children inherits Parents
End class
Sub main ( )
Dim c as New Children
C.MyProperty ( )
End sub
End Module
Also, for an in-depth understanding of VB.Net, click on
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