How to hold the object instance in entire windows application

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Dear Friends,

Here iam facing the Typical problem with notify icon.Here i have Developed a windows application that is Modem Device Detector.Main theme of the Applicaion is when i put any Modem to my CPU.Notify icon message will come, Modem connected sucessfully.When i remove the Modem,Modem disconnected Message will come through Notify icon Up to now this is fine.But When i Disconnected the Modem the Connected Notify icon is still in Active.So i dont know how to Remove the Instance of the Notify Icon

Sample Code: This is when Modem Connected event

C#

NotifyIcon notifyIcon2 = new NotifyIcon();
notifyIcon2.Icon = SystemIcons.Exclamation;
notifyIcon2.BalloonTipTitle = "SmsService Running...";
notifyIcon2.BalloonTipText = "Gsm Modem connected Successfully";
notifyIcon2.BalloonTipIcon = ToolTipIcon.Info;
notifyIcon2.Icon = new Icon("Running.ico");
                          
notifyIcon2.Visible = true;
notifyIcon2.ShowBalloonTip(1);
notifyIcon2.Text = "Modem Connected" + e.Drive;

This is When Modem Disconnected event

C#

NotifyIcon notifyIcon3 = new NotifyIcon();
notifyIcon3.Icon = SystemIcons.Exclamation;
notifyIcon3.BalloonTipTitle = "SmsService Stopped..";
notifyIcon3.BalloonTipText = "Gsm Modem Disconnected Successfully";
notifyIcon3.BalloonTipIcon = ToolTipIcon.Info;
notifyIcon3.Icon = new Icon("Stopped.ico");
notifyIcon3.Visible = true;
notifyIcon3.ShowBalloonTip(1);
notifyIcon3.Text = "Modem DisConnected" + e.Drive;
scrTemp.Stop();
scrTemp.Refresh();
notifyIcon3.Dispose();
notifyicon2.Dispose();

Even the notifyicon is in ACTIVE Still i have used Dispose Concept.

please share any information Regarding this.

Regards,

AnilKumar.D

Posted 10-Jul-12 18:12pm

Anil Honey 206

Updated 10-Jul-12 18:32pm

AmitGajjar

v2

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Trak4Net · Answer 1 · 2012-07-10T19:59:00

I think before you dispose of it you might try setting visibility to false. If you can move the mouse cursor over the icon and then it disappears that is what you will need to do. I have never tried disposing of a notify icon while program stays running so not sure how it reacts.

You actually should be able to re-use a single notify icon without continually disposing and initializing. I am sure you can just change the icon, text, and reconfigure the balloon tip when you need to change modes. I am positive that is how I have done something similar in past to show when scanner was connected/disconnected.

Edit:

Just found my sample from the scanner notify icon I mentioned so thought I'd share my example.

VB

Select Case EventID
  Case WIA_DEVICE_EVENTID.WIA_CONNECT

    Me.NotifyIcon1.BalloonTipIcon = ToolTipIcon.Info
    Me.NotifyIcon1.BalloonTipText = "Connected: " & vbCrLf & devsConnected & vbCrLf & "Disconnected:"
    Me.NotifyIcon1.ShowBalloonTip(2000)
    Me.NotifyIcon1.Icon = New Icon(...GetManifestResourceStream("Active.ico"), 16, 16)

  Case WIA_DEVICE_EVENTID.WIA_DISCONNECT
    Me.NotifyIcon1.BalloonTipIcon = ToolTipIcon.Info
    Me.NotifyIcon1.BalloonTipText = "Connected: " & vbCrLf & devsConnected & vbCrLf & "Disconnected:" & vbCrLf & ScannerDetails.GetScannerName(DeviceID.Split("\")(1))
    Me.NotifyIcon1.ShowBalloonTip(2000)

    If devsConnected = "" Then
      Me.NotifyIcon1.Icon = New Icon(...GetManifestResourceStream("InActive.ico"), 16, 16)
    Else
      Me.NotifyIcon1.Icon = New Icon(...GetManifestResourceStream("Active.ico"), 16, 16)
    End If

End Select

Sander Rossel · Answer 2 · 2012-07-10T20:12:00

This is actually a known problem. There are lots of suggestions on the internet.
Disposing it, as you already mention.
Setting the NotifyIcons Visible Property to false.
Setting the Icon Property to null.

Here's some stuff that may help too.
NotifyIcon still visible after closing form[^]
How to guarantee a NotifyIcon disappears?[^]
Issue with NotifyIcon not disappreading on Winforms App[^]
NotifyIcon will not disappear[^]

It may not be pretty. After all, it's a Component, it should do this stuff by default!... It doesn't though, and we'll have to live with it.

How to hold the object instance in entire windows application

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