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C# How to avoid multiple tray icons when opening multiple windows

I'm working on a C# Windows Forms application with multiple forms and a tray icon.
When my application starts, it adds a tray icon to systemtray, if i show a subform using .ShowDialog I get a new Instance of my application with a second tray Icon.
Here is my code to show the subform:
btnEditor_Click(object sender, EventArgs e)
{
CSV_Editor editor = new CSV_Editor(listEntrys,conf);
editor.ShowDialog();
}
Both forms are winforms and only the mainform has a trayicon.
How to avoid getting two Icons?
Thanks for your help!

Set ShowInTaskbar in your 2nd form to false.

How do I open my closed form through the notifyicon in the taskbar?

Currently I am developing a windows form application in c# that has several forms.
I am running a background form that operates the notifyicon property that allows the icon to appear in the taskbar.
When I launch the program, it will launch a loginForm, after which logging in it will go into a mainForm. After closing the mainForm, the application does not close yet, which in this case works like Windows Live Messenger.
How do I make my program in a way that after I the mainForm, through double clicking it will bring the form back up? (Like how MSN works.)
Or is it a better solution for me to close the whole application when I press the X button in the title bar. Which brings up another problem for me as I cant seem to exit the application when I close other forms other than the main form.

Probably you have NotifyIcon on your main form. Subscribe on the DoubleClick event of this control and change state of your main form in the handler:
private void notifyIcon1_DoubleClick(object sender, EventArgs e)
{
this.Show();
this.Visible = true;
this.WindowState = FormWindowState.Normal;
}

Just set the Visible property of the form to true/false. Or you could call Show()/Hide().

Minimize form to system tray

I want to hide my form while keeping my application running in background.
I've used notifyIcon and it remains always visible.
I've used "this.Hide();" to hide my form but unfortunately my application gets close (no exception).
I am also using threading and this form is on second thread.
Please tell me how can I solve it.

I am also using threading and this form is on second thread.
My crystal ball says that you've used ShowDialog() to show the form. Yes, calling Hide() on a modal dialog will close it. Necessarily so, a modal dialog normally disables all of the windows in the application. If you hide it then there's no way for the user to get back to the program, there are no windows left to activate. That this form runs on another thread otherwise doesn't factor into the behavior.
You'll need to call Application.Run(new SomeForm()) to avoid this. Now it isn't modal and you can hide it without trouble. But really, do avoid showing forms on non-UI threads. There's no reason for it, your main thread is already quite capable.

add the following event handlers for form resize and notify icon click event
private void Form_Resize(object sender, EventArgs e)
{
if (WindowState == FormWindowState.Minimized)
{
this.Hide();
}
}
private void notifyIcon_Click(object sender, EventArgs e)
{
this.Show();
this.WindowState = FormWindowState.Normal;
}
but this is not close you application

C# close to tray (like msn messenger)

I have a c# .net app. So I created a notifyIcon that sits in the tray. What I want to do is when the user hits the "x" button on the form, I want it to close to the tray. They should only be able to exit program by using the context menu in the tray icon.
So what I did was, on the form close event, I check whether the form is visible. If its visible, i set it to invisible and set showInTaskbar to false (simulating minimize to tray) If the form is invisible already, then they are probably closing it from the tray, so I will exit the program in that case.
However, the problem I have is that if the window is visible, but they right click on the context menu of the tray icon and hit exit, I need to exit the program and not minimize.
How do I solve this problem?

try this:
bool _closingFromMenu;
void NOTIFYICON_EXIT_MENU_HANDLER(object sender, EventArgs e)
{
_closingFromMenu = true;
Close();
}
//form closing handler
FormClosing +=(a,b) =>{
if(_closingFromMenu){
Close();
}
else{
e.Cancel = true;
//do minimize stuff;
}
}
or if you have only one form you can call Application.Exit(); in context menu item handler

You probably want to track the state of the application based on the actions of the user as that's not necessarily reflected in the state of the window. So when the user selects Exit from the menu you need to set a flag to indicate that you're really exiting, not just hiding the window.

Just make your Context Menu close event call Application.Exit()

C# Creating A Program That Runs In The Background? [duplicate]

This question already has answers here:
Closed 10 years ago.
Possible Duplicate:
What's the proper way to minimize to tray a C# WinForms app?
How can I create a program that runs in the background, and can be accessed via the Windows' "Notification Area" (Where the date and time are in the lower right hand corner)?
In other words, I want to be able to create a program that runs and can toggle between having a display window and not having a display window.

Drag and drop a NotifyIcon and a ContextMenuStrip.
Set de NotifyIcon's context menu to the one you added
Add 2 menuitems (e.g. Restore, Exit)
Set the Form event resize and do the following check
private void MyForm_Resize(object sender, EventArgs e)
{
if (this.WindowState == FormWindowState.Minimized) this.Hide();
else this.Show();
}
// you could also restore the window with a
// double click on the notify icon
private void notifyIcon1_MouseDoubleClick(object sender, MouseEventArgs e)
{
this.Show();
this.WindowState = FormWindowState.Normal;
}
For a example can download this project
Don't worry about the right click event, the NotifyIcon will automatically detect it and show the ContextMenu