[RESOLVED] How to know when pressing minimize button?

I have a NotifyIcon that, when the main form is minimized, the user clicks in it and the form windowstate returns to normal, but the problem is knowing when the user minimizes the main form window... (The notifyicon is hide while the form is in normal state)

And how can I set the program running in background?

Thanks in advance

Use the WindowState property in the Resize event handler:

VB Code:

Private Sub Form1_Resize(...) Handles MyBase.Resize
    Me.Notifyicon1.Visible = (Me.WindowState = FormWindowState.Minimized)
End Sub

This will hide and show the NotifyIcon as needed.

WOW! This was a record reply! Thanks JMC!
Btw, do you know how to set an app running in background?

Thanks for the help.
:thumb:

I'm not sure what you mean by running in the background. An application is generally considered to be a foreground process and a service is considered to be a background process. If you want your app to continue processing while it's in the tray without affecting other running applications responsiveness, you could reduce the priority of its main thread:

VB Code:

Private Sub Form1_Resize(ByVal sender As Object, ByVal e As System.EventArgs) Handles MyBase.Resize
        If Me.WindowState = FormWindowState.Minimized Then
            Threading.Thread.CurrentThread.Priority = Threading.ThreadPriority.BelowNormal
            Me.ShowInTaskbar = False
            Me.NotifyIcon1.Visible = True
        Else
            Threading.Thread.CurrentThread.Priority = Threading.ThreadPriority.Normal
            Me.ShowInTaskbar = True
            Me.NotifyIcon1.Visible = False
        End If
    End Sub

This could reduce the responsiveness of your tray icon's menu though.

Thank you JMC, I knew that and how to implement it, but I didn't express clearely... I was saying that I would like my app (When minimized) didn't showed on the minimized bar next to Start Menu in Windows.

JMC, I found, nothing more EASY!!
What I wanted besides the help you gave me was hidding my application in taskbar...

I had only to do Me.ShowInTaskbar = False....

Thanks, this has been resolved.