VS 2010 AddHandler Not Adding Second Event Handler For Control?

Jan 6, 2012

I am playing around with Drag and Drop, and I am having an issue with AddHandler. I am creating labels and displaying them on a form. Before I add each label to the form, I add 2 event handlers (DragEnter and DragLeave). When I run the code, it hits the first event handler (DragEnter), but doesn't hit the second event handler (DragLeave). Either I have coded something wrong, or the second handler is not being added.

Here is my code (note this is just something Im playing around with for learning):

Public Class Form1
Private Sub Form1_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load

[Code]....

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Event Handler Not Firing Using AddHandler?

Oct 15, 2010

I have a form with about 40 checkboxes. Once a checkbox is checked, the div control's property should be changed from "none" to "block" or vice versa. I don't get an error, but the checkedchanged event isn't handled. Here is the markup:

<tr>
<td class="sectionSubHeader lightgrey">
<asp:CheckBox ID="chkbxCOMAEFund" AutoPostBack="true" runat="server" />[code]....

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VS 2008 Addhandler & Event Handler Args?

Oct 28, 2009

Perhaps surprisingly I haven't added an event handler programatically before and I'm having trouble getting my head around AddHandler.I am creating a series of DataGridView controls in a loop and want to subscribe to the CellFormatting event on each of them.The event handler signature is as follows;Private Sub ConfigureRows(ByVal sender As System.Object, yVal e As System.Windows.Forms.DataGridViewCellFormattingEventArgs)This works fine when I enter it in the visual editor properties box but I can't figure out how to give it the correct arguments using AddHandler.

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VS 2010 Dynamically Adding A Keypress Event Handler?

Oct 16, 2011

I'm new to VB and trying to add a Key(Down? Press?) Handler to a dynamicly created textbox. The error I get is "'KeyDown' is not an event of 'Object'". How do I fix this?Here are the relevant parts of my

Public Class main
Structure square
Dim box As TextBox
Dim guessedVal As Integer
Dim correctVal As Integer

[Code]...

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C# - Adding Own Event Handler In Front Of Other Event Handlers

Sep 24, 2010

When I utilize AddHandler in VB to add my own method to the Click event :

AddHandler Button.Click, AddressOf myButton_Click

I see that my code executes last - after other event handlers for the Button_Click event. Is there a way to insert my event handler in front of other events so that it executes first?

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Asp.net - Double-clicking On A Form Control In VB 2010 Design View Inserts A Script Instead Of Inserting An Event Handler?

May 8, 2012

When I double click on a form control while in the design view in a Web Application project within Visual Studio 2010, say a 'button' or a 'submit' for example, it inserts a javascript function into my .aspx file. When I do this at work it automatically creates an event handler for the control in the code-behind.How do I change this to that setting?I don't want to type those event handler subroutines every time!

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Asp.net - Double-clicking On A Form Control In Visual Studio 2010 Design View Inserts A Script Instead Of Inserting An Event Handler

Sep 23, 2010

The title pretty much precisely asks the question, but I shall repeat;

When I double click on a form control while in the design view in a Web Application project within Visual Studio 2010, say a 'button' or a 'submit' for example, it inserts a javascript function into my .aspx file. When I do this at work it automatically creates an event handler for the control in the code-behind.How do I change this to that setting? I have used '/resetsettings' already, and other answers to similar questions do not solve my problem. I have reinstalled, gone through every menu I can find (though I may have missed something)I don't want to type those event handler subroutines every time!

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.net - Event Handler Is Never Called Because The Original Event Is Raised In Another Event Handler?

Apr 18, 2011

The event handlers in my parent class are never called though the events are raised in the child class.

The Code:

Public Class childForm
Public Event checkboxchangedEvent(ByVal checkbox1 As Boolean, ByVal checkbox2 As Boolean)
Private Sub checkboxchanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles CheckBox1.CheckedChanged, CheckBox2.CheckedChanged

[code]....

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Control Array Event Handler?

Jun 21, 2010

I create a dynamic number of PictureBox controls. I keep them inside a List. What I want now is to make them clickable: same event handler for all (opening of the image source file) with a parameter. The question is: how can I do it in practice? How I set the handler Sub for every picbox?

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Global Control Event Handler?

Apr 21, 2009

I have a piece of code that i want many ListViews to run throughout the app at ItemUpdated. I'm sure the same can apply to many other control-events.How can I hook up a certain listviews ItemUpdated event to a sub in a class module?

here's my class module Public Class ControlParts

Public Shared Sub LSVItemUpdated(ByVal sender As Object, ByVal e As ListViewUpdatedEventArgs)
Dim lsv As ListView = CType(sender, ListView)
lsv.EditIndex = -1
End Sub
End Class

Now if i add OnItemUpdated="LSVItemUpdated" to my ListView's declaration I get an error that 'LSVItemUpdated' is not a member of 'ASP.admin_order_aspx'. Well, I don't want this on the page. I wan't this to be globaly accessible. I could in the code behind call the LSVItemUpdated, but that will beat the whole point off.

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Add Event Handler For A Control Added In Runtime?

Jan 3, 2010

How do I add an event Handler to a control, for example a textbox, to handle any keypress event?cause I want this textbox(which is added in program runtime) to only accept any convert any small letter to Upper case.

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Button Control Event Handler Method

Apr 20, 2012

When you click on a button control on a web form visual studio automatically put in this code for you in the code behind.
Protected Sub btnSave_Click(ByVal sender As Object, ByVal e As EventArgs) Handles btnFlightInfo.Click
end Sub

Say for example, I wanted to call this method from another method. How would I do that? I know that the sender is the actual button object, but what is e? Here is what I have so far inside another sub. Just trying to get a better understanding of how this method works.
btnSave_Click(btnSave, ??what would you put there??)

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Get Multiple Textboxes To Act As One Control For An Event Handler?

Jul 28, 2011

I am using VB2010 Express to create a Windows Form.

I have been able to add an event handler to a single textbox to respond to the ".Leave" action.

Now I want to take multiple textboxes and use them as a single control and use the same event handler.

Eg. If TextBox1, TextBox2 and TextBox3 are grouped as a single control nothing would happen in those boxes until focus went to any other control on the form.

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Using An Event Handler At Runtime To Control A Button?

May 25, 2012

During the process of my program I am creating several different buttons depending on what file the user selects. I have been able to create these buttons and I would like to set up the event handler so when the user selects one of these buttons it pops up a message box that shows the user the name of the button they just clicked on. The message box isn't the goal of what I would like to do with it but If I could get that to work I would be able to alter the code to get it to work the way I want it to.

Below is my code that I currently have. I don't have the event handler doing anything at this time as I can't seem to get it to work I am still playing around with it.

ublic Sub resizebuttons()
Dim X As Integer = 175
For Each item As String In CSVInput.selected

[Code].....

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Click Event Handler With Custom Control Button?

Jul 19, 2010

I'm creating an ASP.NET Custom Control for my web application which is basically an ASP.NET Button control contained inside multiple <div> elements (for styling purposes).How can I create a Click event handler for my custom control so that my control acts as an ASP.NET Button?

Ie.

<cc:Button id="myButton" runat="server" Text="Submit" />
Sub myButton_Click(sender as object, e as EventArgs) Handles myButton.Click
End Sub

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Event Handler - Catch The Textbox Control In The Datagrid?

Oct 5, 2010

Is there any way to catch the textbox control in the datagrid? like catching its keypress event?

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Event Handler For Dynamically Created Listbox Control?

Jan 24, 2012

I am passing some values from a Gridview Update Click event to a popup ASP.net page that dynamically builds a series of textboxes in a Placeholder based on the number of sentences that are found in a specific cell of the Grid Row selected.The boxes that are built represent each sentence found in the cell of the selected row. Each sentence is presented for translation, where user enters data into a 2nd dynamically generated textbox.This all works great.Now I have a Listbox beside the 2nd textbox, which sometimes has 1 or more variables that need to placed into the translated sentence. I have set up a Hover menu over the listbox so that I can select the variable and insert it at the end of the sentence in the 2nd textbox. My problem is generating the click event on the dynamically created Listbox. Something like....

Protected Sub ListBox1_SelectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) Handles ListBox1.SelectedIndexChanged
TextBox1.Text = TextBox1.Text & ListBox1.SelectedValue

[code]....

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VS 2010 Event Handler In VB Versus C#?

May 21, 2012

I've been fiddling with this for ages and can't get it right. If you have this in C#:

videoSource1.NewFrame +=new NewFrameEventHandler(videoSource1_NewFrame);
void videoSource1_NewFrame(object sender, NewFrameEventArgs eventArgs)
{
// stuff to do in here
}

How would write it in VB? My head is spinning with AddHandler and AddressOf and I can't seem to get it right.

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VS 2010 Remove Event Handler?

Apr 1, 2011

I have a Timers.Timer called COMTimeout, to which I add an event handler using:

AddHandler COMTimeout.Elapsed, AddressOf TimeoutEvent
however, the handler may also be:
AddHandler COMTimeout.Elapsed, AddressOf SecondTimeoutEvent

I now need to remove the handler, is there a way to do it without knowing the name or do I need to keep track of which handler as been assigned?

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Firing An Event Handler From Within A Nother Event Handler?

Aug 27, 2011

How do I get a Event Handler to fire from within a nother Event Handler?

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Force A Commit On The Current Row From Within A Virtual Unbound DataGridView's Edit Control Event Handler?

Sep 8, 2011

Using the walkthrough from [URL], I implemented a DatagridView in virtual mode, totally unbound, in VB 10 Express (we are talking WinForms).

I understand that CommitEdit (DataGridViewDataErrorContexts.Commit) commits the current cell's contents to the data cache.

The example uses row-level commit, i.e. it pushes the values into a row buffer until the current row is left. Only then the row is added to (or updated in) the data store. That's exactly what I do, too.

Question -- how can I commit the current row programmatically without leaving it? (I want to commit the whole row, not just the current cell.)

If the user leaves the row, there is a RowValidating, RowValidated, RowEnter event sequence where the datastore update is taken care of. So one idea (currently my only one) was to simply re-set CurrentCell to Nothing, for example.

But I cannot just set the DataGridView's CurrentCell property to Nothing (or any cell outside of the current row) since I want to commit from within an event handler of a custom edit control created by a custom column, and I see an System.InvalidOperationException exception when setting CurrentCell there.

In fact, it is a tiny button right to a combo box, i.e. I create a DataGridViewComboBoxCell descendant which is a DataGridViewComboBoxColumn descendant's edit control. My special ComboBox cell adds a tiny button which should commit the current row. Unfortunately, that button's _Click event handler cannot change CurrentCell since DetachEditingControl throws the exception then.

Obviously, I must delay the CurrentCell re-assignment until the whole _Click event has been processed. Or what? How would I do that -- register a custom Windows message, SendMessage that one to me, and override the windows procedure of the form so it re-sets CurrentCell when this message is received? (Hello?)

There should be a rather easy way to let DataGridView commit all changes by firing the events that I handle to perform the datastore update, no?

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VS 2010 : Event Handler For Dynamically Created Controls?

Sep 14, 2011

I have to create controls for inputting info to create people objects in the program, because I don't know how many people they are going to input, I have a button that they can press to add more fields.

I need to add a doubleclick event for these dynamic controls (text boxes), how can I create an event for them if they haven't been created yet. Also, as far as I know you cant make a variable part of an object name while declaring it. I need to do something like

Dim dynamicText & (Append variable counter each time a box is made)As New TextBox
dynamicText &variable counter. Name = "TimeTextBox"
dynamicText.Text = "SdgsdG"
dynamicText.Location = New System.Drawing.Point(100, 100)

[code].....

Also is there a way to like copy and paste a group of controls via code instead of having to code each individual one like if I had to do a text box along with a combo box and a lable all at once, can I throw it into something so I only have to recreate the container?

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VS 2010 FileSystemWatcher - When I Load The File In The Event Handler?

Sep 4, 2011

I'm using FileSystemWatcher in an application.it monitors the files in a folder, then do some processing. I monitor FileCreate, Change, Rename, Delete event.the problem is: when I copy some images to that folder, it fired the create event, but the file is not actually ready, so, when I load the file in the event handler, it failed.how can deal with this correctly?

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VS 2010 One Event Handler For Multiple Textbox Controls?

Jan 25, 2012

I have many textbox controls and they are named as txt1.text, txt2.text, txt4.txt etc.I want to raise the event "Leave" when txt1.text leaves or txt2.text leaves.but with a single handler.

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VS 2010 Tooltip Triggers - Hover Event Handler

Jun 26, 2010

I'm working on a program with a fairly complex graphical interface. Due to the volume of information possible in the interface, the tooltip, or something like it, seems likely to be a fairly critical means of obtaining feedback. However, after a bit of testing, there are a few features that I am not really enamored with. First, I am changing the tooltip text dynamically based on the portion of a control that the mouse hovers over. This is done in the Hover event handler. What I am seeing is that once the hover event is raised once for a control, it appears not to be raised for that control again unless the mouse leaves the control and re-enters. Therefore, the tooltip is set based on where the mouse hovers the first time it hovers on the control, then doesn't change until the mouse has left the control.

More disturbingly, the tooltip sometimes doesn't show up at all. It appears that if I am quick enough about moving the mouse over the control, then hovering does nothing and no tooltip shows up at all. The way to get the tooltip to show up is to move the mouse smoothly, and somewhat slowly, over the control, then pause. As long as the motion is slow enough, the tooltip always shows up. However, if the mouse is then moved, the tooltip goes away, and won't return until the mouse has left the control and come back to it. So basically, First, I will look into showing something on MouseMove rather than Hover, as Hover appears to be inconsistent, at best. Yet that doesn't solve the problem that the tooltip is too inconsistent in behavior. Is there an alternative, or timing property settings for the tooltip that improves responsiveness?

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VS 2010 Add Handler For Each Control In Panel?

May 9, 2012

I try to add handle for each control in my panel (panel includes)in a few words I have a panel with other panels inside, the latter in turn contain other panel, here is a screen to learn more:

I try doing this, but it is not the result I want to achieve ... If you look at the picture you will easily understand my problem:vb

For Each ctrl As Control In Me.Controls' in this case Me is my Form1AddHandler ctrl.MouseHover, AddressOf ctrl_MouseOverAddHandler ctrl.MouseLeave, AddressOf ctrl_MouseLeaveNext

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VS 2010 Change Control Handler?

Aug 7, 2011

In a program I am making I have a custom user interface. I have dozens of different panels each containing various controls. When the form opens, a text file which contains the positions of each of these panels (and whether or not they are on the form) is loaded and the panels are placed appropriately

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Remove An Event Handler From Within The Event Handler?

Mar 21, 2012

remove an event handler from within the event handler?

I have a class that gets data from a hand scanner. When the scan is complete and the data is validated, the class fires a custom "ScanComplete" event and returns the data in a custom EventArgs.

In the calling program, I'm creating an instance of the scanning class and adding a handler for the "ScanComplete" event. In the event handler I get the data that was scanned and then remove the handler.

It seems to be working but it feels wrong to remove the handler while I'm running inside the handler. Will this cause a problem?

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.net - AddHandler Only If No Handlers For Event?

Jan 25, 2010

I want to set an event handler only if this is not set:

If GetHandlers(MyWindow.Closed, AddressOf MyWindow_Closed).Length = 0 Then
AddHandler MyWindow.Closed, AddressOf MyWindow_Closed
EndIf

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C# - Raise Event Using AddHandler?

Sep 28, 2009

I am comfortable with Vb.Net events and handlers.how to create event handlers in c#, and raise events.

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