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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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.
I have a userControl11 (either in winform or wpf) which has a ValueChanged custom event. If I put it in client form and in form_load set its value to 100, it will trigger the ValueChanged event. But if I set this value inside the constructor of UserControl1 the custom event won't trigger. How can I force it to do so ?whatever the technical reason, functionally it does make sense. If the object is initializing its value from some sources unknown to the client form and the client form has a textbox bound to this usercontrol value, it is sure convenient that it could refresh its textbox at any time including when the form loads just using one single event handler. Without this the client form has to create another initializer for this bound textbox at form load.
Below the source code of my trials in winform:
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
[code]....
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
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?
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.
I try to sent an event to trigger the parent.Why doesn't the event arrive?Event is public Handler added to parent.
View 3 RepliesI 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 ??
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?
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].....
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.
View 8 RepliesI 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).
View 9 Replieshow can i trigger a label_click event on the press of a key.
View 13 Replieshow 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.
View 3 Replieshow trigger an event on specific time of day?
View 2 RepliesI 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.
View 1 Repliesi'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]....
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].....
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.
View 5 RepliesThis 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?
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.
View 4 RepliesI 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?
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) ??????
View 4 Replies1. 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].....
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
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?
View 7 RepliesI have created a service which correctly starts in the services section in windows. Now I am trying to get it to trigger an event.I put a message box in the timer section just to experiment with getting it to pop up and it does work when I run it within vb but when I deploy it as a service it no longer pops up.
View 39 RepliesI am trying to figure out out ttrigger a click event from a Picturebox object that is created during runtime? application that I am developing using Visual Studio 2008 during runtime a user selects a shape from a Panel3 on the right side of the form and then clicks on a location inside Panel1 where that shape is copied over. Almost like a Visio application but without the drag and drop.The name of my new shape via a is call "C_Object" I would like the user to be able to select this new shape and a click event to be raised but because this PictureBox object was created during runtime I am not seeing the event.
View 2 RepliesI have this asp:hiddenField control:
<asp:HiddenField ID="AuxHiddenField" runat="server"/>
I would like to trigger its (server side) value changed event using Jquery[code]...
I'm looking for an easy and free way to detect my dog's bark using a microphone attached to the computer. Basically, I just need a component to trigger an event when a sound is detected above a threshold...no fancy processing required. I've found some sound components, but they all seem too complicated for this application.
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