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POVB 2010 - I get results at the end of a loop and not during it
 

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    <p>I'm using VB 2010 Express. I have a loop that calls a function named "singlePing" which pings an IP Address. If the application succeeded to reach that IP it turns a certain label back-color into green, otherwise - red. (There's a label for each ip address)</p> <p>When I'm running my application it seems that my application is "stuck" (actually it runs that loop) and after a while it updates the back-color of ALL THE LABLES at once.</p> <p>Why it doesn't update each label at a time? It makes the "user" think that the application got stuck. Here's my code:</p> <pre><code> Private Sub btnActivateMonitor_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnActivateMonitor.Click Dim xmldoc As New XmlDataDocument() Dim xmlnode As XmlNodeList Dim fs As New FileStream(acXmlFileName, FileMode.Open, FileAccess.Read) Dim i As Integer Dim name As String Dim lbl As String Dim ip As String xmldoc.Load(fs) xmlnode = xmldoc.GetElementsByTagName("Unit") For i = 0 To xmlnode.Count - 1 name = xmlnode(i).ChildNodes.Item(0).InnerText.Trim() lbl = xmlnode(i).ChildNodes.Item(1).InnerText.Trim() ip = xmlnode(i).ChildNodes.Item(2).InnerText.Trim() checkUnitStatus(name, lbl, ip) Next End Sub Sub checkUnitStatus(ByVal name As String, ByVal lbl As String, ByVal ip As String) rtbLog.Text = rtbLog.Text &amp; TimeValue(Now) &amp; " Checking ..." &amp; name &amp; "(" &amp; ip &amp; ") ..........." If sendPing(ip) Then Me.Controls(lbl).BackColor = Color.Green rtbLog.Text = rtbLog.Text &amp; "success" &amp; vbCrLf Else Me.Controls(lbl).BackColor = Color.Red rtbLog.Text = rtbLog.Text &amp; "Failed" &amp; vbCrLf End If End Sub '+-------------------------------------- '| Send Ping (ip) '+-------------------------------------- Function sendPing(ByVal ip As String) Dim reachable As Boolean = False Try reachable = My.Computer.Network.IsAvailable AndAlso _ My.Computer.Network.Ping(ip, 10000) Catch pingException As System.Net.NetworkInformation.PingException Catch genericNetworkException As System.Net.NetworkInformation.NetworkInformationException ' Fail silently and return false End Try Return reachable End Function </code></pre>
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