?
Solved

brackground worker help with a listview visual basic

Posted on 2014-03-24
3
Medium Priority
?
261 Views
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
0
Comment
Question by:chadmanvb
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
  • 2
3 Comments
 
LVL 63

Accepted Solution

by:
Fernando Soto earned 2000 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
0
 

Author Closing Comment

by:chadmanvb
ID: 39950748
Thanks!
0
 
LVL 63

Expert Comment

by:Fernando Soto
ID: 39950805
Not a problem, glad to help.
0

Featured Post

What does it mean to be "Always On"?

Is your cloud always on? With an Always On cloud you won't have to worry about downtime for maintenance or software application code updates, ensuring that your bottom line isn't affected.

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Well, all of us have seen the multiple EXCEL.EXE's in task manager that won't die even if you call the .close, .dispose methods. Try this method to kill any excels in memory. You can copy the kill function to create a check function and replace the …
The ECB site provides FX rates for major currencies since its inception in 1999 in the form of an XML feed. The files have the following format (reducted for brevity) (CODE) There are three files available HERE (http://www.ecb.europa.eu/stats/exch…
Michael from AdRem Software outlines event notifications and Automatic Corrective Actions in network monitoring. Automatic Corrective Actions are scripts, which can automatically run upon discovery of a certain undesirable condition in your network.…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …
Suggested Courses
Course of the Month13 days, 10 hours left to enroll

801 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question