accessing a control that's on another form using property

[tmaster]

Within a class, can I create a property that is a listview? Here's what I
tried, but it doesn't seem to work:

'------------ create property to give the second form access to the first
form's listview:

Public Class frmToDoDetail ' (this is the second form)

Inherits System.Windows.Forms.Form

Private m_lvwTD As ListView

Public Property lvwTD() As ListView

Get

lvwTD = m_lvwTD

End Get

Set(ByVal Value As ListView)

m_lvwTD = lvwTD

End Set

End Property

'--- try to access the passed listview:

' I've tried all of these references from frmToDoDetail unsuccessfully:

' The error I get is 'Object reference not set to an instance of an object'.

lvwTD.refresh

me.lvwTD.refresh

me.m_lvwTD.refresh

'------------ try to pass the listview. This sub is part of a form (the
first form) that has a listview on it called lvwToDo:

Private Sub lvwToDo_ItemActivate(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles lvwToDo.SelectedIndexChanged

Dim frmTemp As New frmToDoDetail()

frmTemp.lvwTD = lvwToDo

'After the above statement executes, the debugger says that
lvwToDo={System.Windows.Form.Listview}, but frmTemp.lvwTD=nothing.

[Craig Vick [MSFT]]

Hi tmaster,

It looks like the problem is that the ListView is never created. You may
need something like

Dim m_lvwTD As New ListView

or, you can create the object in your constructor (Sub New)

I hope this helps,
Craig, VB.Net Team

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From: "tmaster" <le*******@travelmasterusa.com>
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Subject: accessing a control that's on another form using property
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Within a class, can I create a property that is a listview? Here's what I
tried, but it doesn't seem to work:

'------------ create property to give the second form access to the first
form's listview:

Public Class frmToDoDetail ' (this is the second form)

Inherits System.Windows.Forms.Form

Private m_lvwTD As ListView

Public Property lvwTD() As ListView

Get

lvwTD = m_lvwTD

End Get

Set(ByVal Value As ListView)

m_lvwTD = lvwTD

End Set

End Property

'--- try to access the passed listview:

' I've tried all of these references from frmToDoDetail unsuccessfully:

' The error I get is 'Object reference not set to an instance of an object'.
lvwTD.refresh

me.lvwTD.refresh

me.m_lvwTD.refresh

'------------ try to pass the listview. This sub is part of a form (the
first form) that has a listview on it called lvwToDo:

Private Sub lvwToDo_ItemActivate(ByVal sender As System.Object, ByVal e As
System.EventArgs) Handles lvwToDo.SelectedIndexChanged

Dim frmTemp As New frmToDoDetail()

frmTemp.lvwTD = lvwToDo

'After the above statement executes, the debugger says that
lvwToDo={System.Windows.Form.Listview}, but frmTemp.lvwTD=nothing.