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VISUAL BASIC.NET

Properties and Object Oriented Database Development with VB.NET 2005
By: Jagadish Chaterjee
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    2006-07-26

    Table of Contents:
  • Properties and Object Oriented Database Development with VB.NET 2005
  • The class “Emp” rewritten with properties
  • Accessing the object properties from the form
  • Using read-only properties to deal with error messages

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


    (Page 2 of 4 )

    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. 

    More Visual Basic.NET Articles
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       · Hello guys. Now you can dip into developing properties in Visual Basic.NET....
     

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