Minimizing a form - C# Discussion Boards

Re: textbox in a webpage problem

23-Sep-04 0:38

hi,

You can use the AtuoPostback of your control and set the value to true. Then write your logic on Textchanged event. This one way and the other one is you can use custom validator control to check your own validation criteria.

If this not serving your purpose better post this on asp.net forum. cause i can't talk much anout asp.net.;)

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S r e e j i t h N a i r
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shambho23-Sep-04 4:21

shambho

23-Sep-04 4:21

use onblur event of textbox and validate (incase of javascript)
else use custom validators with regular expressions.
or even can be done is server side on text changed event but is not recommended

anand

Minimizing a form

exhaulted22-Sep-04 23:25

22-Sep-04 23:25

An easier question than my previous post (i hope), whats the difference between clicking the Minimize button and setting
form.WindowState = FormWindowState.Minimized;

I am trying to get the form to start in the system tray, i have a notifyIcon in the application and when you click the minimize button the form does not show on the task bar, it only appears in the system tray.

If i set the forms window state property in Form_Load() as above then the icon appears in the system tray but the form also shows on the taskbar.

Any ideas?

Kev

Re: Minimizing a form

sreejith ss nair23-Sep-04 1:15

23-Sep-04 1:15

hi,

This seems that i can help you out. But will you explain little bit more. I mean the excat requirement. and what is your previous post ?

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Re: Minimizing a form

eggie523-Sep-04 2:16

eggie5

23-Sep-04 2:16

To hide the the form (in the sys tray if you have a notify icon) just call the Hide Property of the form.

In your case, like this...

form.Hide();

and then to show it again...

form.Show();

/\ |_ E X E GG

Please Help

exhaulted22-Sep-04 23:13

22-Sep-04 23:13

Hi all, i posted a couple of days ago about closing forms and the problems i was having but i was unable to get the problem solved so here it is again, any ideas are welcome.

I have a scheduler program that runs in the system tray, when double clicked an interface is displayed. This program is to be used on PC's in the backoffices of some of our shops and the users are not IT literate so they can't be trusted to not shut the scheduler down.

To get round this i have encoded a password into the assembly that must be entered when the user shuts the pc down or logs off. This way, the only time the scheduler can be shut down is by end tasking it or if one of our admin guys takes remote control of the pc and inputs the password.

The scheduler is in the startup for the users so if they log of and back on it will start again.

All of the above works fine but...

When the user logs windows off the program asks for the password, there will be times when the users at the ahop need to log off / shut down the pc and they don't know the password so the pc wil just hang or wait for an end task. This is the problem, how can i allow the system to shut the program down when the user logs off but at the same time stop the user from closing the program using alt + F4 or the cross in the corner of the form unless they have the password.

My ideas were to either remove the cross and disable Alt + F4, then implement a button to shut the program down. This would allow me to check the password on the button click and leave the form.Close() function alone so the PC can also shut the app down.

Or, if i could tell the difference between the system shutting the app down and the user then i could just check for the password when the user tries to close the app and not when the system does it.

If anyone has any suggestions about how to make my ideas work or any ideas of their own it would be a great help.

Kev

sreejith ss nair23-Sep-04 1:35

23-Sep-04 1:35

hi,
I am trying to help you out. But we can see upto what level i can.;)

You Wrote :

When the user logs windows off the program asks for the password, there will be times when the users at the ahop need to log off / shut down the pc and they don't know the password so the pc wil just hang or wait for an end task. This is the problem, how can i allow the system to shut the program down when the user logs off but at the same time stop the user from closing the program using alt + F4 or the cross in the corner of the form unless they have the password. .

Here if the user is is trying to logoff then you don't want to ask the user to enter password. Am i right ?

See here You can use members in Win32. I will explain how. We have microsoft.Win32 namespace in .NET. Which provides two types of classes,
those that handle events raised by the operating system and those that manipulate the system registry. Here SessionEndReasons is an enum which give you the information that how the current logon session is ending(please see MSDN for more help). You can test this on the closeing event of your form. That means you need to override the oncloseing event in your application.

Eg.

Using Microsoft.Win32.

namespace xx
{
class form
{
//This is not full source code. Only the core part.
protected override void OnClosing(CancelEventArgs e)
{
if(SessionEndReasons.Logoff)
{
//don't ask your user for password

e.Cancel=false;// This will help you to deside whether you want to close or not.
}
else
{
//Ask for password
e.Cancel =true;//This will cancel the closeing event.
}
base.OnClosing (e);
}
}}Is it fine or you want some more explanation

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S r e e j i t h N a i r
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exhaulted23-Sep-04 3:09

23-Sep-04 3:09

sreejith ss nair wrote:
if(SessionEndReasons.Logoff)
{

This doesn't work, i get the error

Cannot implicitly convert type 'Microsoft.Win32.SessionEndReasons' to 'bool'

Kev

sreejith ss nair23-Sep-04 3:24

23-Sep-04 3:24

hi,

Sure you will get that eoor message. Why cause you are trying to convert an enum to bool.

See what i gave you is an idea. What code i gave is a psedocode.

Try to use this idea to impliment your concept. Refer MSDN for more info.

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S r e e j i t h N a i r
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Stefan Troschuetz23-Sep-04 3:39

Stefan Troschuetz

23-Sep-04 3:39

Hi Kev!

Followed this thread a bit, cause I'm curious how your problem solves, and searched a bit myself in MSDN.
Think i found something helpful:
MSDN[^]
Hope I copied the correct link this time Wink | ;)

www.troschuetz.de

Stefan Troschuetz23-Sep-04 3:44

Stefan Troschuetz

23-Sep-04 3:44

Damn, I think I have to continue practicing link-copying Smile | :)

Here's the correct one:MSDN[^]

www.troschuetz.de

exhaulted23-Sep-04 4:00

23-Sep-04 4:00

Hi stefan, thanks for all your help in this, if i ever get it sorted i'll email you the code so you can see it running Smile | :)

The following sounds promising, i'll give it a go

If you are using SessionEnding in a Windows form to detect a system logoff or reboot,
there is no deterministic way to decide whether the
System.Windows.Forms.Form.Closing event will fire before this event.

If you want to perform some special tasks before System.Windows.Forms.Form.Closing is fired,
you need to ensure that SessionEnding fires before System.Windows.Forms.Form.Closing.
To do this, you need to trap the WM_QUERYENDSESSION in the form by
overriding the WndProc function. The following example demonstrates
how to do this in a deterministic way,

Kev

Stefan Troschuetz23-Sep-04 4:11

Stefan Troschuetz

23-Sep-04 4:11

That's exactly the passage that caught my eye.
I'm looking forward to the running code.
Happy programming Smile | :)

www.troschuetz.de

exhaulted23-Sep-04 5:37

23-Sep-04 5:37

IT WORKS!!!!!

Well it took a couple of days but CP and it's members got me there in the end. Thanks all who gave suggestions on this thread and the others Laugh | :laugh:

Kev

last focusd event

Sakkijha22-Sep-04 23:12

Sakkijha

22-Sep-04 23:12

Re: last focusd event

Dave Kreskowiak23-Sep-04 0:29

Dave Kreskowiak

23-Sep-04 0:29

Your question would be better handled in the ASP.NET Forum. And he's right, you'll have to use JaveScript to subscribe to the event and do the validation. This would be entirely client-side script.

RageInTheMachine9532
"...a pungent, ghastly, stinky piece of cheese!" -- The Roaming Gnome

Re: last focusd event

sreejith ss nair23-Sep-04 0:44