This article describes a simple extension of the standard
messagebox with a timeout option. This might be very useful if timed events are used to automatically show message boxes. Using the standard messagebox in such cases will result in a lot of messageboxes on top of each other which will be very irritating for users of your application.
I use this class in my application which runs on a 24/7 base. In case of failures of the application, I have to show this to the user. If the user does not see/react to the message presented to him, my application still has to take some action. So, after an optional timeout, the
messagebox is closed.
Using the Code
The code exists of one main class:
and two helper classes:
int timeout = 5000
bool model = false;
MsgBoxExtOptions options = new MsgBoxExtOptions
("Do you want to close this application?",
MessageBoxButtons.YesNo, MessageBoxIcon.Question, timeout, model);
This class has one
public method. The
show method checks whether there is a
messagebox active. If so: it does nothing if the
msgBox is model and closes it if it is not active.
If timeout > 0, a timeout timer is started.
messagebox is started in a thread:
public static bool Show(MsgBoxExtOptions options)
if (_currentOptions != null)
return false; }
_currentOptions = options;
if (options.timeout > 0)
timeoutTimer = new System.Windows.Forms.Timer();
timeoutTimer.Tick += new EventHandler(timeoutTimer_Tick);
timeoutTimer.Interval = options.timeout;
timeoutTimer.Enabled = true;
msgBoxThread = new Thread(new ThreadStart(startMsgBoxThread));
msgBoxThread.IsBackground = true;
On timer tick, the current
messagebox is closed and a result event is generated:
private static void timeoutTimer_Tick(object sender, EventArgs e)
_currentOptions = null;
closemessagebox() makes use of
killwindow() which in its turn makes use of two native functions:
sendmessage to destroy the current dialog.
private static void KillWindow(string className, string title)
IntPtr handle = FindWindow(className, title);
SendMessage(handle, WM_NCDESTROY, (IntPtr)0, (IntPtr)0);
- 12th July, 2010: Initial post
I completed my master in electrical engineering at the University of Twente in the Netherlands in 2007. My special interest is software/hardware application which can be used for health purposes.
Currently, I am PhD-student at the Radboud University in Nijmegen, The Netherlands. I am involved in a project in which an monitoring and feedback application is developed for daily-life usage.
My personal interests: bicycling, salsa dancing and gardening