3 values

You know actually, Structures are a "lightweight class type", given that structures provide a way to define a type that supports encapsulation but cannot be used to build a heirarchy of related types (as structures are implicitily sealed, which means you cannot derive a structure from another structure).  When you need to build a family of related types through inheritance, then you will need to make use of class types.

Structures can define constructors, can implement interfaces, and can contain any number of properties, methods, events, and overloaded operators.

Observe how the following Structure and Class are identical:

Here's an example of a Structure that stores 3 related numbers:

    Public Structure MyNumbersStructure

        'Create a constructor that takes 3
        '  numbers as arguments
        Public Sub New(ByVal no1 As Integer, _
                       ByVal no2 As Integer, _
                       ByVal no3 As Integer)

            Number1 = no1
            Number2 = no2
            Number3 = no3

        End Sub


        Private mNumber1 As Integer
        Public Property Number1() As Integer
            Get
                Return mNumber1
            End Get
            Set(ByVal value As Integer)
                mNumber1 = value
            End Set
        End Property


        Private mNumber2 As Integer
        Public Property Number2() As Integer
            Get
                Return mNumber2
            End Get
            Set(ByVal value As Integer)
                mNumber2 = value
            End Set
        End Property


        Private mNumber3 As Integer
        Public Property Number3() As Integer
            Get
                Return mNumber3
            End Get
            Set(ByVal value As Integer)
                mNumber3 = value
            End Set
        End Property


        'Override the ToString Function
        Public Overrides Function ToString() As String

            Return String.Format("[Number1: {0}; Number2: {1}; Number3:  {2}]", _
                                 Number1, Number2, Number3)

        End Function

    End Structure



Here's an example of a Class that stores 3 related numbers:

Public Class MyNumbersClass

    'Create a constructor that takes 3
    '  numbers as arguments
    Public Sub New(ByVal no1 As Integer, _
                   ByVal no2 As Integer, _
                   ByVal no3 As Integer)

        Number1 = no1
        Number2 = no2
        Number3 = no3

    End Sub


    Private mNumber1 As Integer
    Public Property Number1() As Integer
        Get
            Return mNumber1
        End Get
        Set(ByVal value As Integer)
            mNumber1 = value
        End Set
    End Property


    Private mNumber2 As Integer
    Public Property Number2() As Integer
        Get
            Return mNumber2
        End Get
        Set(ByVal value As Integer)
            mNumber2 = value
        End Set
    End Property


    Private mNumber3 As Integer
    Public Property Number3() As Integer
        Get
            Return mNumber3
        End Get
        Set(ByVal value As Integer)
            mNumber3 = value
        End Set
    End Property


    'Override the ToString Function
    Public Overrides Function ToString() As String

        Return String.Format("[Number1: {0}; Number2: {1}; Number3:  {2}]", _
                             Number1, Number2, Number3)

    End Function

End Class