Create A Cancelable Event In .net?
Aug 28, 2009
IN VB.NET (not c#)I want to create an event than can be canceled by the listener. Just like you can cancel the closing event of a winforms form in which case the form won't close.I have already implemented a derived class from EventArgs that has a settable Cancel property as follows:
Public Class AnnounceNavigateEventArgs
Inherits EventArgs
Private _cancel As Boolean = False
[Code]...
The listener I have setup is setting the property to Cancel=True. I thought ByRef meant that both _cancel and cancel would point to the same location on the stack and that setting _cancel=true would therefore make the cancel = true. But this is not the behavior I am getting. _cancel becomes true in the setter but I guess the argument to the constructor remains false.
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Sep 7, 2009
create an Enter event.
Private Sub txtField_KeyPress(ByVal Index As Integer, ByVal KeyAscii As Integer)
Dim vbkeyreturn As ValidationConstraints
If KeyAscii = vbKeyReturn Then
MsgBox("hello")
End If
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Feb 10, 2009
I am using the folowing logic to create an event that can be canceled...
Code:
Public Class ParentClass
Private WithEvents MySubClass As New SubClass
Public Sub DoSomething()
[Code].....
It is my opinion that if you needed multiple things to happen either you would implement some coordination between your event handlers as to who chould cancel when, or have one handler that calls the multiple methods and decides the cancel in one place?
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Jun 8, 2009
have just declare a button and it appeared on the form.but i want to create event for it.example event click:this is code create button
Dim btn As New CButtonLib.CButton
Dim CBlendItems5 As CButtonLib.cBlendItems = New CButtonLib.cBlendItems
CBlendItems5.iColor = New System.Drawing.Color()
[code].....
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Oct 17, 2009
How do I create an event with many handlers. I use the followingo code but it failed. Am I missing something?
Protected Sub myhandler_CheckedChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles CrdCb1.CheckedChanged, CrdCb2.CheckedChanged
End Sub
[code].....
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Jul 14, 2011
for the past >8 years i was doing VB / VB.Net work now I'm jumping into C# world, so far it's very easy only thing that I find difficult is the fact that the signature of every events on object are not automatically created for me.I'm used to select the object name in the left dropdown in the code view and then the event that I want in the right dropdown.is there something similar to that in C#? if yes where can i find it, I really wish I don't have to write them by hand...
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Sep 17, 2011
I have a form that I am adding a set of buttons to. I am adding an event to those buttons. I need this event to function slightly to determine what button was pressed.I need the button to simply set a string variable equal to the clicked buttons text so I can determine what button was pressed.How can this be accomplished?
''
'Adding the buttons
''
For Each dr In dtMenus
Dim strMenuName As String
[code]....
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Oct 17, 2011
I am wondering if it is possible to create Task Scheduler Event that would run my program with a command line argument at a specified time.
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May 19, 2012
I want to create a track bar using paint event, but the problem is on mouse move event<Me.Invalidate()> is very slow since the graphic become unvisible for milli seconds and then return back, is there a way to make it faster?(doesn't become invisible)
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Oct 29, 2009
how to create an event which runs when a proccess finishes.
First, the program launches a batch file, so in the task manager, it appears as "CMD.EXE".
So, the event goes on when the CMD is over.
I'm not sure about what code should I use to do so.
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Apr 26, 2011
how to create a new event for some variables , i will explain what i mean..
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Jan 6, 2012
I have a form that depending on results from a table would create a number of buttons using code at runtime. This could range from 1 to 20 buttons. What I am struggling with is creating a generic mouse over event for each of these buttons? The reason why I want a generic mouseover event is that depending on the text on the button I would do certain things, instead of duplicating the same code in individual mouseover events.
[Code]...
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Jan 6, 2012
I have a form that depending on results from a table would create a number of buttons using code at runtime. This could range from 1 to 20 buttons. What I am struggling with is creating a generic mouse over event for each of these buttons? The reason why I want a generic mouseover event is that depending on the text on the button I would do certain things, instead of duplicating the same code in individual mouseover events.
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Oct 2, 2009
i create runtime form and this form one button create at runtimeand that button's click event handle at runtimehow do this at runtime?i project is runtime create calculator
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Nov 17, 2010
I'm pretty sure i'm not doing this right but i hope by asking this someone can show me the right path.I've created a function that creates a label and 7 checkboxes arrays . So depending how many names i get from my database, it creates that many for the label and the other checkboxes.
Now my function is inside a module which i call in my Class Form during "Load".
So what i want to do is be able to code in an event where the user checks on one of these
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Apr 27, 2010
I can create event prodcedures for form objects, but is there a way to create an event that triggers when a certain variable equals a certain value?
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Aug 10, 2010
I'm using winform and fb.net. Any example of how to create a buttons click event?
I have
dim but as windows.forms.button
but.name
but.text
but.location
etc.
but I how do I create the Click and the code behind it?
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Nov 15, 2010
We have made on run time a printDocument object.
Dim pd As New PrintDocument
pd.Print()
How do we get the PrintPage and the BeginPrint events?
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Mar 18, 2012
I am trying to open _blank link to a new window,I have succeeded in doing so after a hard workBut How do i get window size from the java script , Like this
<A HREF="javascript:void(0)"onclick="window.open('http://www.msn.com/','linkname','height=380, width=300,scrollbars=no')">Link Name</a>
[code]....
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Apr 18, 2009
I have a tool strip menu item who's collection is filled from a subroutine that loads all available com ports on the computer at for load. I know how to generate a click event for menu items that are filled, but not if they haven't been filled already. I guess it doesn't need to be a click event. It just needs to do something that I can get the .text and use it to configure a serial port.
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Sep 18, 2009
I want to create a event handler that detects a Directory created/deleted event. is it possible to do using a FileSystemWatcher?
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Jul 11, 2011
I am attempting to create a timer that will activate a tick event every 1 second until stopped by an "If" statement. The tick event should then drive a clock measuring time in units of hours, minutes and seconds. The if statements handle the time readout, timer stop and activate another form after a set number of hours have elapsed. I have tried several different methods and while my application is running, it does not add increments to the integers representing the time units, refresh the displayed time units, or perform any of the timer related functions. I assume the cause is that I just don't know as much as I think I do (which isn't much)
Here is the applicable code:
Imports Microsoft.VisualBasic.ApplicationServices
Imports System.IO
Public Class SessionManager
[Code].....
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Dec 25, 2009
I'm trying to create an event handler for a graphic elipse, so I can do the math in a separate "control box". There will be multiple graphic elipses feeding the TextBoxE1 box. ( As for all the note textboxes.) This is a graphic creation of a guitar neck that will tie to a 2 table database. Click on a note & it will be identified, a series of notes will call on the related scales from the database. The problem is that I need to create an event handler for each graphic elipse so the code won't fire unless the elipse is clicked on. If only one elipse in that keynote value is clicked, it will put a "1" in TextBoxE3. TextBoxE1 & TextBoxE2 will be hidden.
TextBoxE1 value = "0" until at least one "E" is clicked. ( Elipse that is valued as "E".)
TextBoxE2 value = "1"
TextBoxE3 value = TextBoxE1 + TextBoxE2
[code]....
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Jun 21, 2010
I am developing an application and I use a 3rd party library which is basically Native excel. The problem is that this library does not implement an event which is able to notify me when the value of a cell value changes.
[code]...
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May 30, 2009
I have this code to create an event when a link is clicked in my browser:
Dim link As HtmlElement
Dim links As HtmlElementCollection = Me.document.Links
For Each link In links
[Code]......
How do I get the target of the link (The url which the browser will navigate to when the link is clicked)
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May 24, 2010
I'm using an on key down event for my datagridviewer that fires every time a key is pressed while the datagridviewer is selected(Focused).I want the same thing to happen while in a cell, but there is no event for key down in a cell.
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Jul 1, 2009
I need to Create Calender w/Very Basic Event Entry. Any suggestions on how I would go about this. I have seen some controls to do this, but I need to do this without buying anything.
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Nov 16, 2010
I'm trying to create an array of checkboxes dynamically and also want to put event to those checkboxes. For example: I have a array of checkboxes - Chk1, Chk2. I want it to work this way: When I check Chk1, I want to disable Chk2, and when Chk1 is unchecked, Chk2 is enable, and vice versa.
[Code]....
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Jan 6, 2012
I have a form that depending on results from a table would create a number of buttons using code at runtime. This could range from 1 to 20 buttons. What I am struggling with is creating a generic mouse over event for each of these buttons? The reason why I want a generic mouseover event is that depending on the text on the button I would do certain things, instead of duplicating the same code in individual mouseover events. I am writing in VB.Net.
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Nov 22, 2010
How could I create declaration(event) to a variable control in VB .net ? [code]please i need to know how to insert this (declaration) newweb_ DocumentCompleted it's similar to WebBrowser_DocumentCompleted but it's a variable
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