Overloading

VB.NET:- Over Loading
BCA -501

2
What is overloading?
 Overloading is the process of declaring methods of a class having the same name but
different signatures.
 The signature of a method comprises of the name of the method, the number and types
of arguments. The return type of method is not a part of the signature and hence cannot
be used as a factor for overloading.
 In VB.NET, functions, procedures, constructor and properties within a class can be
overloaded.
 The Overloads keyword is optional when overloading, but if any overloaded member
uses the Overloads keyword, then all other overloaded members with the same name
must also specify this keyword.

3
Example of Procedure Overloading
Module Module1
Public Class X
Sub Sum(a As Integer, b As Integer)
Dim c As Integer
c = a + b
Console.WriteLine("Sum of {0} and {1} is {2}", a, b, c)
End Sub
Sub Sum(a As String, b As String)
Dim c As String
c = a + b
Console.WriteLine("The concatenated string is " & c)
End Sub
End Class
Sub Main()
Dim Y As New X()
Y.Sum(10, 20)
Y.Sum("Hello", " World")
Console.ReadKey()
End Sub
End Module

4
Constructor Overloading
Module Module1
Public Class X
Public Sub New()
Console.WriteLine("Parameterless Constructor is called")
End Sub
Public Sub New(X As Integer)
Console.WriteLine("Integer parameter is passed through
Constructor")
Console.WriteLine("Value passed : {0}", X)
End Sub
Public Sub New(X As String)
Console.WriteLine("String parameter is passed through
Constructor")
Console.WriteLine("Value passed : {0}", X)
End Sub
End Class
Sub Main()
Dim x1 As New X()
Dim x2 As New X(10)
Dim x3 As New X("Programming")
Console.ReadKey()
End Sub
End Module
 Constructor Overloading is a special
case of method overloading.
 Parameterized Constructors that satisfy
the rule for overloading can be used
within classes.

Overloading

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Overloading