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brackground worker help with a listview visual basic

Posted on 2014-03-24
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Last Modified: 2014-03-24
My application will update a label depending on if it can ping a workstaion in the background.  This part works fine, but I would also like the background worker to ping a list of workstations for a listview and update the listview in the background.  When I added the code to check the listview I'm getting a cross threaded opperation error.  How can I get this to work?

 'background for ping check
    Private Sub BackgroundWorker1_DoWork(ByVal sender As System.Object, ByVal e As System.ComponentModel.DoWorkEventArgs) Handles BackgroundWorker1.DoWork
        Try

            e.Result = My.Computer.Network.Ping(strWorkstation, 1000)
        Catch ex As Exception

        End Try


        'change forecolor to red for workstations that have a user logged in them
        For i As Integer = 0 To ListView1.Items.Count - 1

            If PingCheck(ListView1.Items(i).SubItems(0).ToString) = True Then

                ListView1.Items(i).ForeColor = Color.Green
            Else
                ListView1.Items(i).ForeColor = Color.Red
            End If

        Next
    End Sub
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Question by:chadmanvb
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3 Comments
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 39950342
Hi chadmanvb;

That is because you are trying to update the UI from a thread that did not create the UI itself. Please see the following MSDN article on how it can be done.

Updating the UI from a Secondary Thread
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Author Closing Comment

by:chadmanvb
ID: 39950748
Thanks!
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LVL 63

Expert Comment

by:Fernando Soto
ID: 39950805
Not a problem, glad to help.
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