Why is ShowInTaskbar freezing the application?

Question

I need to hide my Form at startup of the operating system(windows 7).
To accomplish that, I tried the solution:-

if (Program.Args == "/startup")
{
    this.Hide();
    this.ShowInTaskbar = false;
}

I had the above code in my form1_Load Event, Program.Args is the command line argument supplied to my program.

What is wrong in the above code?

How can I accomplish hiding of my form through command line arguments?

As some people suggested to use
this.WindowState = FormWindowState.Minimized
this.ShowInTaskbar = false I tried it but my application freezes, like this:-

enter image description here

If I comment out the line
this.ShowInTaskBar = false
it runs normally but shows the icon in task bar.

Normal Look of the application is :-

enter image description here

Your code seems correct, Just put a break-point at if block and check whether your argument is correct or not. — Mohammad Arshad Alam, Feb 06 '14 at 06:01
I guess it is the only form you have. Then it is a main form. This might help http://stackoverflow.com/questions/8764745/how-to-hide-the-mainform-and-still-run-the-program http://stackoverflow.com/questions/70272/single-form-hide-on-startup — Pavel Voronin, Feb 06 '14 at 06:05
@Arshad I double checked, my command line arguments are correct. — Pratik Singhal, Feb 06 '14 at 06:05
are you wanting no visibility at all like a silent mode, or if it briefly shows is that alright? — Mark Hall, Feb 06 '14 at 06:10
No, I want that only it's icon should be visible in the notification tray and the form should not be visible to the user unless he clicks on the icon in notification tray — Pratik Singhal, Feb 06 '14 at 06:12
See this [SO Question](http://stackoverflow.com/questions/2978597/how-do-i-launch-net-windows-forms-application-with-no-visible-windows) it appears that if you set forms WindowState to minimized and to not be shown in taskbar it will work. — Mark Hall, Feb 06 '14 at 06:15
@MarkHall I tried your solution, but it is not working, please see the edited question. — Pratik Singhal, Feb 06 '14 at 07:01
Why are you setting `ShowInTaskbar` to false *when you're hiding the form*? It's not going to show in the taskbar (or alt+tab menu) when it's hidden. — Luaan, Jan 24 '17 at 12:48

score 0 · Answer 1 · edited Feb 06 '14 at 05:56

0

Try Something like changing the visibility. I get an error code on your code because of conversion of Args to string ... but this works just fine.

private void Form1_Load(object sender, EventArgs e)
{
    this.Visible = false;
    this.ShowInTaskbar = false;
}

edited Feb 06 '14 at 05:56

Surya Narayan

558
2
16

answered Feb 06 '14 at 05:53

Ronnie

239
2
9

Thanks for the reply, but `this.Visible = false` doesn't work – Pratik Singhal Feb 06 '14 at 05:56
What are you using as a code editor and compiler? Visual Studio 2012 is what I used, and it worked just fine. – Ronnie Feb 06 '14 at 05:57
I am using Visual Studio 2012 , and also In any case the code should work whether you use Visual Studio or a normal csc.exe – Pratik Singhal Feb 06 '14 at 06:03
Are you getting any error messages or just simply nothing happening? I am also on a different operating system, so I am going to get different results more than likely. – Ronnie Feb 06 '14 at 06:42
Nothing is happening. – Pratik Singhal Feb 06 '14 at 06:43
Have you tried minimizing the form as its WindowState property in command line? like this: this.WindowState = WindowState.Minimized; this.ShowInTaskbar = false; – Ronnie Feb 06 '14 at 06:45
Yes I tried it but the problem is that when I write `this.ShowInTaskbar = false` the application freezes, without it it works normally. – Pratik Singhal Feb 06 '14 at 06:48
Gotcha. is there any events following like an indefinite loop that it is entering or something? – Ronnie Feb 06 '14 at 06:49
No, if I comment out this line then it runs perfectly. – Pratik Singhal Feb 06 '14 at 06:52

score 0 · Answer 2 · answered Feb 06 '14 at 06:48

0

    private void Form1_Load(object sender, EventArgs e)
    {
        this.WindowState = FormWindowState.Minimized;
        this.ShowInTaskbar = false;
    }

Then create a icon for the tray and show tray icon

answered Feb 06 '14 at 06:48

Ronnie

239
2
9

It's freezing the application, check the edited question – Pratik Singhal Feb 06 '14 at 07:03
@ps06756 Using the designer for Visual Studio, can you F11 through and see if it is freezing up in the designer by where the reference is placed for the load event. is it getting stuck there when it is loading your application deigner? – Ronnie Feb 06 '14 at 20:05

score 0 · Answer 3 · edited Dec 13 '19 at 01:48

In the properties of the form (in VS) set next properties :

ShowInTaskbar = false
WindowState = Minimized

Best do this in the design form of VS not in the load event. If you are application is still freezing then please remove all other code except the clicking event on the notification icon to show the window. I simulate it with a clean form (only a button on it) and did not have a freezing problem. Here is the code that you have to execute when the user click on the notification icon:

WindowState = FormWindowState.Normal;

Why is ShowInTaskbar freezing the application?

3 Answers3