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c# Why is the taskbar icon not changing when my form icon changes? [duplicate]

This question already has answers here:
Change pinned taskbar icon (windows 7)
(9 answers)
C# - Changing the icon of the taskbar
(7 answers)
Closed 4 years ago.
I have a button which runs a job, let's replace the job with just a 'Sleep' for a few seconds. When clicking the button, the form's icon changes:
private void ButtonStartClick(object sender, EventArgs e)
{
this.Icon = Properties.Resources.RED_32x32_ICON;
System.Threading.Thread.Sleep(4000);
this.Icon = Properties.Resources.GRE_32x32_ICON;
}
This successfully changes the icon for the 'Form' that the button is on - but it's NOT changing the taskbar icon?!
I'm fairly sure I had something similar running in VB last year whereby changing the currently visible form icon would change the taskbar icon too. This was great for showing when my app was "busy"
I tried changing the default icon for my app and inheriting it, and also just applying my icon at form load...
private void MainForm_Load(object sender, EventArgs e)
{
// this.Icon = Icon.ExtractAssociatedIcon(Application.ExecutablePath);
// this.Icon = Properties.Resources.GRE_32x32_ICON;
}
There are a few related hits when googling this but mainly to do with just changing the icon via the app settings and not during run time?!

c# create system tray application that remains in tray after application closed

private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
{
ShowInTaskbar = true;
this.WindowState = FormWindowState.Normal;
}
//Its not working to show my application icon in tray on application Exit.

When you exit the application, the tray icon goes away.
Also, when you close the last window, the application exits.
You want to minimize and hide the main window instead of exiting. You can do this with Hide(); somewhere in your Windows Forms code. Then, when the user wants to show the form, just run form.Show().

WPF Change between 2 windows

I have been searching everywhere for the answer to my problem but i cant seem to locate anything.
I am trying to open 2 different windows, that i have already created, after a button press. On the button press, i go to open the new window, but it just opens a blank window, not the window i want.
This is my function that i am trying to open my new window with, and it is inside my MainWindow, and i want to open my window i have created in Jobs (see image below).
void Jobs_Clicked(object sender, RoutedEventArgs e)
{
Window Jobs_Window = new Window();
App.Current.Jobs = Jobs_Window;
Jobs_Window.Show();
this.Close();
}
Solution Explorer

You are creating an instance of the standard Window class rather than your custom Window that you have made.
If you have added a Window, called JobsWindow for example, then create an instance of that rather than just the .NET built-in Window:
void Jobs_Clicked(object sender, RoutedEventArgs e)
{
Window Jobs_Window = new JobsWindow();
App.Current.Jobs = Jobs_Window;
Jobs_Window.Show();
this.Close();
}

Windows Service in system Tray [duplicate]

This question already has answers here:
How can I display a system tray icon for C# window service.?
(2 answers)
Closed 7 years ago.
I have created a windows service in C#. I want this service to be moved to the system tray and have a popup menu with start/stop options and a settings form should also open from the menu.
Can anyone please guide me.

I also wanted to do this once, you can do it by adding a NotifyIcon to the service.
Then adding this to the script
notifyIcon1.MouseClick += notifyIcon1_MouseClick;
void notifyIcon1_MouseClick(object sender, MouseEventArgs e) {
//yourcodehere
}
Then add a ServiceController class to handle stopping and starting the service
you can also add the following to handle the workstation being locked
Microsoft.Win32.SystemEvents.SessionSwitch +=
new Microsoft.Win32.SessionSwitchEventHandler(SystemEvents_SessionSwitch);
void SystemEvents_SessionSwitch(object sender, Microsoft.Win32.SessionSwitchEventArgs e) {
//yourcodehere
}

System Tray Icon

Okay firstly I just started C# so I'm not exactly the most skilled programmer out there. Okay so here's my problem that may seem stupid to you guys ;)
I have a simple enough app that a friend asked me to do. So far I have managed with a bit of Google but I'm stuck with this. The app runs fine and minimizes to the system tray and maximizes from the system tray which is good. However, when I open a second form from that application it creates another icon in the system tray and starts duplicating every time I open another form. So eventually I have lots of icons and all of them are seperate instances of the main form. System Tray events
private void notifyIcon_systemTray_MouseDoubleClick(object sender, MouseEventArgs e)
{
if (FormWindowState.Minimized == WindowState)
{
Show();
WindowState = FormWindowState.Normal;
}
}
private void CronNecessityForm_Resize(object sender, EventArgs e)
{
notifyIcon_systemTray.Visible = true;
if (FormWindowState.Minimized == WindowState)
Hide();
}
private void restoreContextMenuItem_Click(object sender, EventArgs e)
{
Show();
WindowState = FormWindowState.Normal;
}
To open the Form:
private void preferencesToolStripMenuItem_Click(object sender, EventArgs e)
{
CronPreferences.formPreferences CronPreferences = new CronPreferences.formPreferences();
CronPreferences.Show();
}
Close it:
private void button2_Click(object sender, EventArgs e)
{
this.Hide();
}
How can I have all Forms map to the same icon in the System Tray?

You will need a single global tray icon that they all access. Do this by using a static variable that stays the same throughout different instances of the class.
Then, if you want to:
Open one form: keep a reference to the latest form in a variable and open it.
Open all minimised forms: iterate through each form and open them again.

If I got it right, you want to keep only a single instance of your application running. In that case, your title is a bit misleading since your problem has nothing to do with tray icons or multiple forms.
Code Project: A Single Instance Application which Minimizes to the System Tray when Closed
On the other hand, if you really have a main form in your app, which opens the second form (which creates a tray icon), in that case you simply need to make sure your second form is instantiated only once:
public class MainForm
{
private SecondForm _secondForm;
public void OpenSecondForm()
{
// create it only once
if (_secondForm == null)
_secondForm = new SecondForm();
// otherwise just show it
_secondForm.Show();
}
}