[Timer] Trigger Event Manually?
Feb 12, 2010
This application is meant to run at all times to download a web page every minute.To avoid freezing the UI, I read that the best solution is to move the code from a While/Sleep loop to a Timer that will be triggered every minute.The problem I have, is that the user must wait for a minute before the event is triggered:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Timer1.Interval = 60000
Timer1.Enabled = True
[code]....
Is it possible to force this event to occur instead of waiting for it?
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Feb 12, 2010
Eg. ""vb.net" timer event trigger on purpose". This application is meant to run at all times to download a web page every minute. To avoid freezing the UI, I read that the best solution is to move the code from a While/Sleep loop to a Timer that will be triggered every minute. The problem I have, is that the user must wait for a minute before the event is triggered:
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Timer1.Interval = 60000
Timer1.Enabled = True
[CODE]...
Is it possible to force this event to occur instead of waiting for it?
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Feb 18, 2012
I have a main form that has a dynamically generated treeview and also a panel control. Depending on the selection made within the treeview the panel docks 1 of three diffrent usercontrols which are full sub forms(done for ease of modifing design of sub form rather than layering panels on top of panels).Upon button click withing usercontrol i wish to trigger event within main form.For example delete button wich then triggers to remove current selected node from treeview. code for 1 of three diffrent user controls
Dim ctrlQ As New QuoteUC(TrViewQuotation.SelectedNode)
PnlSubFormDock1.Controls.Add(ctrlQ)
Code for delete button for which i need to raise event.
If MsgBox("Are you sure you wish to delete this customer ?", vbYesNo, "Delete Record") = vbYes Then
Deletecustomer(n)
End If
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Aug 8, 2010
I am looking to create a 500ms timer that I can use to make some text flash.Setting up the timer is straight forward enough, but I have not found an example of letting the timer create an exception so I do not have to poll it for a timeout.
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Jul 9, 2009
I have a timer on a page in ASP.NET.
After a certain period of time elapses, I want to disable the timer.
I want to put a static variable in the timers tick event that will track how many seconds have elapsed.
My question is, will this work?
If user X and Y are viewing the page will they both have separate local static variables?
What is the best method of shutting down an ASP.NET timer after a certain elapsed time?
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Apr 23, 2009
I have a windows application that need to process som quite time consuming jobs. In my first try i did all processing under
the form thread. The result was bad response and update of the form due to the heavy jobs.To get around the problem with bad response from the form i created a new class "processing" where i put all the data processing. Then i instanciated a background worker where i in the "doWork" sub created a new instance of "processing".The "processing" class creates a timer from system.timer, and the timer drives the processing.On the Timer event Elapsed the timer starts a new thread from the thread pool.
My problem is now when i want to asynchronously close the background worker (with the corresponding function call what ever it is called ...) there is still a timer thread out there that causes exceptions for me.
1. How can i close my background worker and at the same time have the timer to be stopped?
2. Is there a way to synchronize the timer event so that the timer executes from the background worker thread?
3. Is there a better approach for me to adapt?
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Jan 11, 2011
I want to create an array of timer in vb.net. My problem is that how will i raise the tick event for a particular timer, say mytimer(x).tick and inside the tick event there is also a button, say mybutton(x) which changes location every interval. for example:
public class blah
dim mybuttons(20) as button
dim mytimer(20) as timer
private sub form_load(....) handles me.load
for x as integer = 0 to 20
[Code]...
i dont know what to do next, all i want is to pass the button mybuttons(x) to mytimer(x) tick event, in which their index number are the same. i want to create one timer per button. how to do that? please help me and post example codes. i've researched the net but i cant understand passing variables, addhandlers, etc. i'm just new to programming object oriented.
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Feb 19, 2012
I have this code in my ViewProductsInventory (which is called from my MainForm by ShowDialog):
Private Sub ViewProductsInventory_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.Tb_inventory_datesTableAdapter.Fill(Me.InventorySysDataSet.tb_inventory_dates)
Dim inventory_date As Date
inventory_date = Me.cboInventoryDate.Text
[Code] .....
Upon clicking the editbutton will execute EditForm.ShowDialog()
And in my EditForm the record will be updated, after which will trigger ViewProductsInventory.btnSearch_Click( ViewProductsInventory.btnSearch, EventArgs.Empty)
And then the error "Conversion from string "" to type 'Date' is not valid" occurs.
I tried Msgbox(Me.cboInventoryDate.Text) and returns nothing. I'm assuming that my cboInventoryDate is not being populated at this time therefore when btnSearch_Click is triggered it receives nothing.
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Jul 31, 2010
I try to sent an event to trigger the parent.Why doesn't the event arrive?Event is public Handler added to parent.
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Jun 5, 2009
In .NET I have a class called Caption. I have another class called Gauge. Within the Gauge class I have a property defined as a Caption.I am trying to figure out how to do thefollowing:When a certain property is changed in my Caption class how do I get it to execute a subroutine in the Gauge class? I am thinking I have to declare an event and AddHandlers to fire it off, but I can't think of how to accomplish this.
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Nov 29, 2009
I am trying to build an add-on for some software. they are done using vb.net
I want to trigger an event called project selected but dont seem to get the option.
Ive selected the control but the event doesnt appear in the options list i can override the event by doing a Addhandler myControl.ProjectSelected, AddressOf newEvent is there any way in my newEvent method to run the orginal ProjectSelected event ??
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Jan 27, 2010
I have a set of accordian divs (powered by the prototype library) in an asp.net page. I would like to save the state of the accordian, so when a postback event occurs, the same div is open rather than reloading the page entirely and opening the default div.
My plan was to set a page control value with the ID of the open div using the div's toggler click event function, and then fire a click event after postback calling that same div (using the value of the control holding the div ID) as the target. I'm not sure how to fire a javascript click event from vb.net however, and this sure seems like a lame workaround.
1) can you tell me how to fire a javascript click event from the vb.net codebehind page
-or-
2) is there a more elgant way to do this?
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Mar 29, 2009
i am trying to allow a user to press enter in a text box to trigger a text change of an object...
1. say u put 2 in a text box called "Number" and
2. when you press enter,
3. another object named "penbutton" to change it's text, that u can see on the picture to "write"..
4. originally the book will have the text "Start" on it
do i changed the "number text box" enter event ? how do i do this? This is what i have so far
Private Sub xNumberTextBox_Enter(ByVal sender As Object,
ByVal e As System.EventArgs) Handles xNumberTextBox.Enter
Me.NumbertextBox.AcceptsReturn = True
[Code].....
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May 3, 2012
I have a project with many forms on it, some of them are dialog forms, some of them are mdi children of my master form. What I need to do is when a user press the ESC button on his keyboard to dispose the form that is working on. either is mdi or dialog form. I know that I can use the event of the form key down and then check the key code if is the esc to dispose the form, but this is not I looking for since I will have to pass from all my forms and create that event. Is there any other way when my master form is load to create my own event for any form load event? And trigger it from there to assigne my custom code for ESC key. So I will not have to pass from all the forms to create that event.
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Apr 27, 2012
I have a class library in which i have created a simple new application with a form and added AX webbrowser control on it. In order to apply events on popup of webapplication shown in webbrowser (or to detect whether a pop-up has opend), i am using LostFocus event on webbrowser control, it was working fine till now.But after i reset my IE settings (Internet options->Advance->Reset) the event stopped working. I am using IE9 and the class library is developed in VB.NET (VS 2010).
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Oct 15, 2011
how can i trigger a label_click event on the press of a key.
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Jan 27, 2009
how to trigger a textchanged event. I want to enter data in one text box and have the rest of the data show up after i fill it in. For example I enter someones name and then 3 other text boxes fill in with his height weight and ect after i entered his name.
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Dec 15, 2011
how trigger an event on specific time of day?
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Jun 17, 2010
I am trying to display the progress bar(marque) in a separate form (progressForm) while i do some calculation in background. I know the typical way of doing it is to include the calculation in background worker and show progressForm in main thread. This approach how ever will lead to lot of synch issues in my application hence I am showing the progressForm using progressForm.ShowDialog() inside the background worker process. But I need to trigger the Completed event with in the application to close the form.
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Apr 12, 2009
i'm trying to trigger control events from outside the form that the control is placed. The idea is test of that control.
How this can be done.
For example I'm trying this
Private Sub SendGenData(ByVal ContName As String)
Dim testControl As Control
For Each testControl In Me.Owner.Controls
[Code]....
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Jun 4, 2009
I read some articles about using events and/or class events, but not a single article realy explainend the true use and benefit of using events in classes, but only how to use them.
As far as I understand, you can use an event to trigger a certain procedure of a class within another class or aspx page, but you can do the same by declaring an object of that class and call de procedure or methods directly. why and when or where we would use an event with addhandler to call a routine from a class and not declare an object of the class and call the desired routine directly.
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Apr 6, 2011
I am trying to use multiple handles to trigger one event but I need each handle to effect the event differently. I feel like this should be simple. I want to use a Select Case to select the alteration but I can not figure out how to identify the handle used and convey that to the Select Case.
Private Sub Event(ByVal sender As System.Object, ByVal e As _
System.EventArgs) Handles Button1.Click, Button2.Click
Select Case handles[code].....
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Mar 8, 2012
I have one form (FormA) that fills a combobox with data when the on-load event is trigged.In that combobox, I can select "New value" which opens another form (FormB) on top of FormA.On FormB I add the new data and saves them to a Database.Everything OK till here.I then close FormB.... and return my attention back to FormA.Now I would like to reload data into the combobox, but everyway I have tried, it will not work.
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Aug 23, 2009
I am trying to raise the PropertyChanged event of an EntityObject, I don't find a way to do it?
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Aug 14, 2009
I want to assign an event to trigger when I right click on a button. I notice one of the events listed as available is the MouseClick. Also RightMouse button is listed as an e.Buttons value. However when I right click the button the event dosnt trigger.
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Nov 8, 2010
I think I have a timing issue. On the trigger of an event I call a function to update a value:
Private Sub t0_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles t0.Click
Input.ppProperty = "blank"
UpdateRecord("Hey", Input.ppProperty)
MsgBox(Input.ppProperty)
End Sub
[Code] .....
Notice the difference, the property does not update until the function is completely finished.
Why?
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Oct 23, 2009
Im connecting a infrared transmitter by serial port, Rs232 to my pc. Anyone know the coding for the comport to detect the signal and auto trigger a sms event(by gsm modem) ??????
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Mar 29, 2009
1. say u put 2 in a text box called "Number" and2. when you press enter, 3. another object named "penbutton" to change it's text, that u can see on the picture to "write"..4. originally the book will have the text "Start" on itdo i changed the "number text box" enter event ? how do i do this?This is what i have so far
Private Sub xNumberTextBox_Enter(ByVal sender As Object,
ByVal e As System.EventArgs) Handles xNumberTextBox.Enter
Me.NumbertextBox.AcceptsReturn = True
[code].....
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Feb 22, 2012
I have a flash video player embedded in a page which has javascript calls for it's controls, specifically calling playStarted() when the play button is pressed. I want to capture this event asynchronously to record when people are actually playing the video versus visiting the page, but I'm not really sure how to do this.
I was thinking the "hack" of a way would be to create a javascript function called playStarted() that would post the video ID to a separate ASP.NET page that would then record it to SQL (where I store my data on page visits and where I want to store my data on video plays.)
But ideally there is a better way to do this where I can register the javascript to the script manager so it can trigger a public sub asynchronously when it's called
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Sep 7, 2009
I've got a textbox with a mousehover event and that event will only happen once and then I have to move my mouse out of the text box before it'll happen again. Is there a way to reset the mousehover event 'trigger' so that it happens as many times as I want?
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