VS 2010 Can Get System.timer To See Items In Datagrid?
Jun 18, 2012
I have
- system.windows.forms.timer with a 20 second interval
- it checks the status of a website using HttpWebResponse
- I have a datagridview with a column that holds the website(s) name
- Once the timer gets the results its places the results in another column on the datagridview
- a for loop will loop through the column that holds the websites name and posts the results for each row/website.
If all the sites are up and running it works fine. If a site is down HttpWebResponse takes about 10 seconds to return the reason why and the program can not be used during that time. So I read up on timers and realized there were 3 kind. The System.Timers.Timer sounded like a better solution since it runs on a worker thread. This sounds perfect since the user can still use the GUI without waiting for the timer to realize the site is down.The problem I have is if i tried to get the row count of the datagridview so I can loop through the sites messagebox. show (frmMain. dgvMonitoredSites.Rows.Count - 1) it will always return 0 even if there are over 10 rows. It's almost as if it's looking at a datagridview in another instance. Is there anyway I can get this system.timer to see the items in the datagrid?
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Jun 15, 2009
I'm wondering what exactly is the difference System.Timers.Timer and System.Windows.Forms.Timer???
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Jan 4, 2011
I've tried a couple things to add items to a combobox (I've also Googled a lot but haven't found anything for VB2010) and on top of that, how to make it so that if the user selects 10ms, it changes the Timer1.Variable to 10.
Here is my progress from what I found on Google
Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
ComboBox1.Items.Add("10ms")
[Code]....
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Feb 4, 2012
I have a System.Windows.Forms.Timer named "DialogBoxTimer" set up on a form. When the form loads, it has a command to stop the timer. I have a routine [SPDataRecd(...)] that handles SerialPort1.DataReceived from a serial port (modem). When it is activated by a modem event, I want it to start the timer [DialogBoxTimer.Start()], but it doesn't work.If the timer is running, SPDataRecd can *stop* the timer [DialogBoxTimer.Stop()], but it can't start a stopped timer.
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Oct 13, 2011
I have a datagrid and has items of quantity, product, desc etc is it possible that i will get all the items in my datagrid and put it all in my database im thinking of using the datatable or dataset.
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Mar 3, 2012
I`m fairly new to coding (2 weeks) and having some trouble with a timer application to control a greenhouse misting system. The problem arose after resolving the 65 second interval limitation for tmrPause, it appears the tmrPulse line is never reached as lblCycleStatus.Text doesnt display "Pulse" where it did before. I may have bitten off more than i can chew for a first project but i`d appreciate any pointers as to where i went wrong so i can learn from it.[code]
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Jan 15, 2009
I need an accurate timer to interface a Windows application to a piece of lab equipment.I used System.Timers.Timer() to create a timer that ticks every 10 msec, but this clock runs slow. For example 1000 ticks with an interval of 10 msec should take 10 wall-clock seconds, but it actually takes more like 20 wall-clock sec (on my PC). I am guessing this is because System.Timers.Timer() is an interval timer that is reset every time it elapses. Since it will always take some time between when the timer elapses and when it is reset (to another 10msec) the clock will run slow. This probably fine if the interval is large (seconds or minutes) but unacceptable for very short intervals.Is there a function on Windows that will trigger a procedure every time the system clock crosses a 10 msec (or whatever) boundary?
UPDATE: System.Timers.Timer() is extremely inaccurate for small intervals.I wrote a simple program that counted 10 seconds several ways:
Interval=1, Count=10000, Run time = 160 sec, msec per interval=16
Interval=10, Count=1000, Run time = 16 sec, msec per interval=15
Interval=100, Count=100, Run time = 11 sec, msec per interval=110
Interval=1000, Count=10, Run time = 10 sec, msec per interval=1000
It seems like System.Timers.Timer() cannot tick faster that about 15 msec, regardless of the interval setting.Note that none of these tests seemed to use any measurable CPU time, so the limit is not the CPU, just a .net limitation (bug?)For now I think I can live with an inaccurate timer that triggers a routine every 15 msec or so and the routine gets an accurate system time. Kinda strange, but...I also found a shareware product ZylTimer.NET that claims to be a much more accurate .net timer (resolution of 1-2 msec). This may be what I need. If there is one product there are likely others.
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May 29, 2011
I have an application that saves details to then be viewed in a datagridview on another form. Clicking on an entry in the datagrid (I want to make this double-click, but haven't bothered to try yet) highlights the row, and loads the values to a new form, in read-only text boxes. Clicking Edit changes the read-only value of these text boxes and allows you to edit (obviously) the contents. I have another button, Save which I want to click to commit the changes to the loaded items in the datagrid.
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Apr 4, 2012
Here is the stack trace:
2012-03-16 19:15:09Z E System.NullReferenceException: Object reference not set to an instance of an object.
at System.Timers.Timer.set_Enabled(Boolean value)
at System.Timers.Timer.Stop()
Here's the code:
Timer declared as private member variable.
Private _myTimer As System.Timers.Timer
Initialize timer method.
[code]....
The timer has to have a value or else the Timer.Stop() call would be throwing the exception. This is a sporadic error and I'm just trying to see if anyone has experienced this before or if anyone has any ideas of what could be causing it. It is occuring in a WinForms application in the event handler for the Elapsed event of the Timer, but it is only occuring sporadically on the users computer. I haven't been able to reproduce the error myself.
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Jul 4, 2011
How can I incorporate the timer so once a page loads the timer activates, waits a few seconds then I tell my program what to do next.I tried this code but it didnt work:
Timer1.Interval = 5000
Timer1.Enabled = True
Timer1.Start()
[code]....
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Mar 14, 2010
I need help writing an application which is a status changer. For testing purposes, I'm pulling each item in a list and displaying each to a message box. In reality, it won't be a message box. I'm using a FOR LOOP to accomplish this. [code]...
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Jun 30, 2009
Whats wrong with my code?I need to move the the cursor position at the next item in my listbox for very tick of my timer. And stop my timer when the position is at the end of listbox.
Private Sub Timer1_Tick(ByVal sender As Object, ByVal e As System.EventArgs) Handles Timer1.Tick
Dim x As Short
[code].....
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Nov 4, 2009
I have used system.timers.timer to watch several folders and move files in my windows service. But the timer event stops now and then. I have read that it is better to use system.threading.timer in services.This is my system.timers.timer
Private Timer As New System.Timers.Timer
AddHandler Timer.Elapsed, New System.Timers.ElapsedEventHandler(AddressOf Me.Timer_Elapsed)
Timer.Interval = 4000
Timer.Start()
[code]....
How do this code look like in system.threading.timer?How do i start and stop the timer using threading? That is very important because i stop the timer when it comes to the elapsed event and when the code har run it starts the timer again!
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Oct 27, 2010
In vb6 you used timer for the randomize seed.I noticed vb10 no longer uses it. Does this mean by default it uses the system timer for the seed?
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Aug 2, 2010
I have an application that I'm writing that needs to run 3 different Timers. One that will run every 5 minutes, 1 that will run every hour and 1 that has to run once a day sometime after 5:00 P.M. I know that I can seperate the application into 3 seperate applications and use Windows Scheduled Tasks to perform this however I would prefer to have everything in 1 application and just run the different Sub/Functions off of the appropriate Timer. I'm trying also figure out a way to avoid 2 timers firing at the same time.
What i would like to do is tell the 5 minute timer to run say 2 minutes after every 5 minute mark in the our so the first one would be at 12:07 and then the next would be at 12:12 and so on. The hour timer should run sa at 12:20. The daily one run at say 5:31.Is it possible to use the System.timer or the System.Threading.timer in this way?
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Jun 27, 2012
I'm looking at how to pause a System.Timers.Timer and I cannot figure out the proper way to pause it without resetting the timer.
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Oct 1, 2009
For the last couple of days I been trying to add items to a listbox from another class within a system.timer.
They just don't appear in the listbox. I don't get any errors. The items just don't get added :S.
I have:
Form.vb
make object of Control
Control.vb
Here I have a system.timer
In the Timer_Elapsed method I do this: form.listbox1.items.add("hello")
But it just doesn't work... When I add a new item to the listbox1 from the constructor or another method that has nothing to do with the timer it works...
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Apr 18, 2011
I have a problem with the Timer class in that there is a chance that a timer would fire right before you call Dispose() since you will probably call Dispose() from some other thread. You may have something like:
Public Sub TimerTick() Handles itsTimer.Elapsed
Do Something
End Sub
And then from somewhere else in the code, when your app is done, you call
itsTimer.Dispose()
The only way I can think of doing this is:
Public Sub SomeMethod()
SyncLock(itsTimer.SynchronizingObject)
itsTimer.Dispose()[code]...
This is not a great thing to do esp. since I am holding a lock on an object I am disposing. I can create my own lock and syncLock on that but is there a simple way?
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May 7, 2008
I have a Windows Service -which contains a System.Timer -which get enabled and started in the OnStart event handler.In the Timer Elapsed event -I make a call to a routine within another DLL. The problem is that the Timer Elapsed event never fires... I have a test application -which works fine. This is written in VB.Net 2008 framework 3.5
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Jun 9, 2010
I have application that use MSSQL database. Application have module that is using for sending messages between application users. When one user send message to another I insert message in database, and set message status to 1( after user read message database I update and set message status to 0). Now, I am using system.timers.timer for checking message status, and if message status 1 user get alert that he has one message inbox. The problem is that this application can be used by many users, and if timer run ever 5 minutes this gone slow application and database.
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Jan 11, 2010
Hello,
I'm writing a windows service and initially tried just using a regular System.Windows.Forms.Timer, but never saw it's tick event get fired in my debugger. From doing some research, it appeared that I needed to use the S ystem.Timers.Timer control instead. In order to make debugging easy, I set my timer interval to a really short value 1000 ms. I'm seeing some rather strange behavior, though. It appears that my timer control is creating multiple threads within my application, or is this just a bug in my debugger? I have an event handler for the Elapsed event like so:
[code]...
When I step through my code like this, it now appears to work as expected. Has anyone else run into this?
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Sep 27, 2011
Trying to get System.Threading.Timer to work!! I am converting a small form based application to run as a services, The app just runs an monitors a folder and then when it finds a file to does some work on it. Having changed the form.timer to threading.timmer - The timer stopps working after a while. Below is a simple test services - when you look in to the text file it stops after approx 130 entries
[Code]...
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Oct 18, 2009
is it possible to specify a System.Timers.Timer with 0.1ms interval?
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Jun 6, 2011
how can I filter the items on my datagrid which is displaying the data from my SQL server database, through a textebox text.
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Jun 4, 2009
I have a datagridview and I have a column combobox. (First column) I want to add item to combobox of datagrid. But I cant get name of it.
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Mar 8, 2011
I'm creating a multi-threaded application (although it is not at the moment) which will be connecting to a large number of sockets. I've noticed when a connection cannot be made the connect timeout is rather large, so I am trying to make my own. Here is what I have come up with...
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
CreateSockets(2)
AssignSockets(0, "192.168.31.2", 80, False, False) 'shouldn't connect
AssignSockets(1, "192.168.1.1", 80, False, False) 'should connect
[code]....
Looking at the timeoutOccured() sub, you can see I'm unsure of how to specify which index to set. Efficiency is important since this will be housing a lot of connections at once. Something else that just came to mind, would .theTimer.Stop reset the tick value on the timer?
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Aug 4, 2011
I am a newbie, but I am unable to get this code working. FileSweeper is supposed to start a timmer that triggers fileCopy on a web server. fileSweeoer is triggered by global.asax.ileCopy then will copy the filWould it make any difference if this was a class running on a web server?
Imports Microsoft.VisualBasic
Imports System
Imports System.Threading
[code].....
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Dec 15, 2011
How can I get SQL Date and time into statusstrip with timeer control
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Mar 16, 2009
I have used timers in .Net for a long time now an never had this problem.Start timer to fire every 10 seconds that reads an object and updates the UI using a delegate.This works great until the form is minimized several times, then the timer thread seems to vanish.Anyone come across this before?
Obviously I can roll my own using a thread directly and sleeping it, however this seems like reinventing the wheel when a threading timer class exists already.
Code: Private Sub m_Tmr_Tick(ByVal state As Object)
[code].....
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May 24, 2012
I have 2 listboxes I want to insert items from listbox 1 in column 1 of the datagrid view and items from listbox 2 in column 2 of data grid view the below code will add items from listbox1 to column1 of the datagrid view :
DataGridView1.ColumnCount = 2
DataGridView1.Columns(0).Name = "File Name"
DataGridView1.Columns(1).Name = "Status"
[code]....
what can I do to insert the items of listbox 2 in column 2 of the data grid view.
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