Access an object from other forms

[microkarl]

All,
If I declare a new object, say, a Hashtable in Form.Load event, how can I access this object from another form? The worse is, I can't even see this object from other events in the SAME form. Does anyone have any clue?

Thanks,
Carl

 

[MrPaul]

Class level variables and properties

Variables declared within a method are local to that method only and not from other methods within the same class. To allow the variable to be used by other methods it must be declared at class level:

Public Class MyForm
    Inherits Form

    'Class-level variables
    Private m_htable As Hashtable

    'Intantiate within Form_Load
    Private Sub Form_Load(ByVal sender As Object, ByVal e As EventArgs) Handles MyBase.Load
        'Use m_htable
        m_htable = New Hashtable()
    End Sub

    'Use within other methods
    Private Sub Form_Paint(ByVal sender As Object, ByVal e As PaintEventArgs) Handles MyBase.Paint
        'Use m_htable
        m_htable.Clear()
    End Sub

End Class

To allow htable to be accessible from outside MyForm it should be exposed using a property. Unless you want other classes to be able to change the actual instance of htable, you should declare the property ReadOnly:

Public Readonly Property HTable As Hashtable
    Get
        Return m_htable
    End Get
End Property

Good luck

 

[snarfblam]

This old thread might be relevant.