Properties and Object Oriented Database Development with VB.NET 2005 - The class “Emp” rewritten with properties

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Since I explained the “properties” in the previous section, we shall rewrite the class “emp” by adding properties to the fields as follows:

Public Class Emp

    Private m_empno As String
    Private m_ename As String
    Private m_sal As Double
    Private m_deptno As Integer

    Public Property sal() As Double
        Get
            Return m_sal
        End Get
        Set(ByVal value As Double)
            If value < 0 Then
                Throw New Exception("Salary cannot be negative")
            End If
            m_sal = value
        End Set
    End Property

    Public Property empno() As String
        Get
            Return m_empno
        End Get
        Set(ByVal value As String)
            m_empno = value
        End Set
    End Property

    Public Property ename() As String
        Get
            Return m_ename
        End Get
        Set(ByVal value As String)
            m_ename = value
        End Set
    End Property

    Public Property deptno() As Integer
        Get
            Return m_deptno
        End Get
        Set(ByVal value As Integer)
            m_deptno = value
        End Set
    End Property
...
End Class

In the current case, I included validation for the property “sal” only.  Based on the requirements, you may need to add a few more validations to a few more properties accordingly. 

Next: Accessing the object properties from the form >>
 

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