Warning On RemoveHandler For UserControl Event

Feb 27, 2010

Using VB2008 Express I'm getting the following warning on a RemoveHandler statement and subsequent issues since the event is still hooked. Warning 1 The 'AddressOf' expression has no effect in this context because the method argument to 'AddressOf' requires a relaxed conversion to the delegate type of the event. Assign the 'AddressOf' expression to a variable, and use the variable to add or remove the method as the handler.

[Code]...

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Event Addhandler, RemoveHandler Repetition Conundrum?

Apr 14, 2010

I'm getting a bit more fluent in VB.Net, but am still a bit green around the edges in certain aspects. I'm creating custom controls, and am starting to rely heavily on AddHandlers to manage them.Until recently, I didn't realize that you can add multiple event handlers for the same control and same address

[code]...

The above code would create 10,000 copies of the same event, and if I would click on combobutton1, the event would fire 10,000 times. I only need to fire the event once, but sometimes my code is a bit circular, and there may be an instance where two or more addhandlers are designated for a given control and address. Is there a way to have a loop on my custom dispose event where it would look something like:

[code]...

Or better yet, remove all events from a control(On a side note, is there any way in the debug mode to see all the active events attached to a control?)

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Using Event From Within UserControl

May 3, 2010

I believe I am on the right path but didnt get it to fire. userControl1 contains a lstBox, it has MouseDoubleClick event doing something inside the userControl. But I want to add something to that event from the form containing the userControl1. So when I mouseDoubleClick the lstBox inside UserControl1 I want to fire the code in my form eventHandler and in the control eventHandler? RaiseEvent?

Public Class myForm
'CodeBehind of form containing userControl1
Private Sub UserControl1_MouseDoubleClick(ByVal sender As System.Object,
ByVal e As System.Windows.Forms.MouseEventArgs
) Handeles UserControl1.MouseDoubleClick
ds1.clear()
[Code] .....

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.net - Override Event On A UserControl?

Mar 24, 2010

I have a WinForms application (OwnerForm) with some UserControl. When textbox of UserControl is changed, I want to filter content of a OwnerForm. But how can I make it? I don't want to specify OwnerForm inside the user control. I know a solution to add manually handlers for MyUserControl.tb.TextChanged to some functions on a owner form, but I think it's bad way. I'll prefer to have overridable functions, but I can't imagine how to do it.

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Add Usercontrol In Event With .net 2003?

Nov 30, 2009

how to add usercontrol in event (dll)

private panelMain as System.Window.Forms.Panel
private usrControl as System.Windows.Forms.UserControl
private sub obj_responseMessage(byval envt as Integer) as Handles obj.responseMessage

[code]....

error: An unhandled exception of type 'System.ArgumentException' occurred in system.windows.forms.dll Additional information:Controls created on one thread cannot be parented to a control on a different thread.

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.net - UserControl Closing Event In Winforms

Mar 4, 2010

I'm trying to save some layouts from DevExpress Grid Controls so that users can change the layouts and reload them in at a later use of the control.

My question is this for speed issues I am loading the control via a user control inside of a form. Now my problem is I am creating the control by adding an instance of the control to a panel control inside of a tabbed group control when the tab is made visible and then clearing the control when the control is hidden.

If ClaimsGridPanelControl.Visible = True Then
ClaimsGridPanelControl.Controls.Add(New RXClaimsGridControl(ClaimsBindingSource))
Else
ClaimsGridPanelControl.Controls.Clear()
End If

So inside of the RxClaimGridControl I need to call a SaveLayout method when I am clearing the control. But there is no event, at least that I can find, that triggers when a usercontrol is removed/closed/hidden.

My thoughts for handling the .Clear() would be to raise an event in the parent control and then to handle that event inside of the user control.

Is there some event that I am missing in regards to the removal/closing/hiding of a user control, or is there a better way to do this.

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Dropdown In UserControl - Event Is Not Raised

Jan 11, 2012

I have a user control named "LettersDropControl". It has a dropdown list. I am using this control in a aspx page. When I change the selected item it is not calling the ddlLetters_SelectedIndexChanged event handler? What change I need to make in order to execute the code in ddlLetters_SelectedIndexChanged event handler?

<%@ Control Language="C#" AutoEventWireup="true" CodeBehind="LettersDropControl.ascx.cs" Inherits="MSAJAX1.LettersDropControl" %>
public partial class LettersDropControl : System.Web.UI.UserControl {
private string selectedLetter;
public string SelectedLetter {
[Code] .....

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Asp.NET Dropdownlist In Usercontrol Not Firing SelectedIndexChanged Event

Feb 25, 2010

Asp.Net 2.0 framewrok - VB.Net application I have a UserControl containing a Asp.Net DropDownList.

Things already researched and or tried:

The control gets bound to data on page load inside if not Page.IsPostBack (only loads once) ID proprety is set for control (ID = ddlMyControl) AutoPostBack is set to true EnableViewState on the control is set to true AutoEventWireUp in the UserControl declaration is set to true EnableEventValidation is set to false in the parent page

The control will not fire it's SelectedIndexChanged event no matter what I do.

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DataBound UserControl And PropertyNameChanged Event In .net Winforms?

Oct 30, 2009

I have a UserControl, with a TextBox and a databound property - Value.Value can be any object such as a Color, Array, Font etc.Any time the text changes, the property Value is changed as long as it is valid.Looking at the msdn article: How to: Apply the PropertyNameChanged Pattern , it says I should use the PropertyNameChanged Event patternfrom the control side.Now, If I have DataSourceUpdateMode = OnValidate, then I don't even need to apply this pattern. If, say. my Value property is bound to a colour field in a business object, then after I type red, in the textbox and tab to another field, then any other fields on the form, that bind to the same colour field, are updated immediately.

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UserControl MouseLeave Event Not Firing On Form?

Apr 16, 2012

I created a little usercontrol that looks similar to Visual Studios toolbox. It works great in the user control project, but when I import it to a form the MouseLeave Event doesn't work. The MouseEnter event works fine however. Any idea why only the MouseLeave event doesnt work? I did notice that I have to use the Panel controls MouseLeave, MouseEnter events for things to work correctly. The Usercontrol Mouseleave and Mouseenter didn't work at all.

Public Class vsStyleToolBox
Public isPinned As Boolean = False
Public isShowing As Boolean = False

[code]....

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.net - SerializationException, Avoid UserControl Consuming An Event To Be Serialized?

Aug 3, 2011

I attempt to serialize an object, and it throws an exception as shown below. I assume it attempts to serialize also the UserControl that subsribes to an event of the class I try to serialize. This is not desired. So how do I avoid serializing events?

SerializationException occured:Type 'System.Windows.Forms.UserControl' in Assembly'System.Windows.Forms, Version=2.0.0.0, Culture=neutral,PublicKeyToken=b77a5c561934e089' is not marked as serializable.

[code]....

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Raise Event Inside Usercontrol When A Variable Is Changed

Jan 29, 2011

I have a usercontrol in my application and inside of this usercontrol I have a declaration:

[Code]....

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Asp.net - DragDrop Event Not Firing On Object Inside Usercontrol (but DragEnter Does)

Feb 12, 2012

Well the title pretty well describes my problem. Here is a little bit more detailed description of my problem: I am building an application with a TabControl, which I populate at execution time with TabPages. In my first version of the code, these TabPages were filled with a children ListView. The ListView was also created in code, using AddHandlers to link it to the DragEnter and DragDrop routines. Everything worked very well... Now as I need some other controls on every TabPage, instead of creating every single control in code, I have created a UserControl containing a ListView and a few Buttons, which I instantiate for every new TabPage. The problem now is that the DragDrop event is not raised anymore

[Code]...

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Dequeue Data In Paint Event Of A UserControl To Show Continuously Moving Waveform?

May 11, 2011

Given this illustration and basic code, how do I dequeue and draw the data that has been inserted into the User Control's Preperty queue? The graph/chart will need to show anywhere from 1 to 120 seconds of data, with each second representing electrical waveform data that arrives each second with a variable amount of sample data..The timer interval will have to vary with the amount of incoming data so that it shows a continuously moving waveform from right to left and the rate of drawing keeps up with the amount of data arriving. (so the queue doesn't get backed up)

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Do I Have To Use RemoveHandler?

Sep 15, 2011

If I always need to call RemoveHandler after using AddHandler, where is the best place to do so? I have searched several similar questions as follows, but I do not quite understand.When and where to call the RemoveHandler in VB.NET? AddHandler/RemoveHandler Not Disposing Correctly..I thought garbage collection in c# or vb.net will take care of unused objects. Also, in vb.net designer, it automatically generates Dispose Sub. So I did not pay attention to programally releasing resource at all. Will I have any memory leak problems? Please kindly provide me some links/documents for me to start learning.[code]

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Call RemoveHandler In Program?

Apr 27, 2010

I am working to a VB.NET windows forms projet in .NET 1.1. And I have this type of architecture, very simplified.[code]...

Depending of the type of test I am doing I create an instance of a specific test derived from BaseTestLogic. But I found that after hundreds of object creations I can have StackOverflow exception.

I checked my code and saw that I forgot to remove the handler to Timer Tick. The question is, where and when is it correct to remove hadler?

Do I need to implement the IDisposable interface in the base class and RemoveHandler in Dispose?

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VS 2005 AddHandler/RemoveHandler?

Feb 23, 2010

the concept of AddHandler/RemoveHandler with a very simple example?

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VS 2010 : UserControl MouseEnter/Leave Events Aren't Firing - Cannot Raise Base Event From Derived Class

Feb 18, 2011

When i use my UserControl in a project my Mouse Enter & Leave events aren't firing, i assume i fix this with a raiseevents in my usercontrol. However when i try to do this it says something about "cannot raise base event from derived class".

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Addhandler - Use RemoveHandler & Anonymous Methods?

Sep 16, 2011

How do I use RemoveHandler with anonymous methods? This is how I add a handler for MyEvent event of the class MyClass

AddHandler MyClass.MyEvent, Sub()
...
End Sub

How do I then use RemoveHandler to remove the handler for the MyEvent event

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RemoveHandler Syntax In VSTS 2008 RTM?

Feb 5, 2008

The VB documentation shows the Syntax for RemoveHandler statement as:

RemoveHandler event, AddressOf eventhandler and shows a Sample usage as:

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VS 2010 RemoveHandler With Lambda Expressions?

Jul 1, 2011

To streamline code, I increasingly rely on lambda expressions. But I may have hit against the wall in the attempt of removing an event handler set by a lambda expression. This really eludes me. The code below shows two samples: Alt1 uses a plain lambda expression as delegate and works fine: the object size increases as the numeric control varies. However, the drawback is that the handler cannot be removed:

RemoveHandler Me.upDnScale.ValueChanged, Sub(sender As Object, e As Object) ScaleObject1(sender, e, objTgt)
According to this MSDN article, a variable should be used to set/remove lambda based handlers. Alt2 shows a couple of attempts, but none works.

[Code]...

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Events And Why RemoveHandler Is Required For Memory Leaks

Feb 18, 2010

I have attempted to understand the behind-the-scenes stuff for Events several times. I must have read at least a dozen articles but there is still some ambiguity in my head.

[Code]...

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C# :: Call Function From UserControl On ASPX From UserControl On MasterPage?

Jan 31, 2011

I have MainLayout.master that has UC_Menu.ascx on it. I have a page named Customer.aspx that uses MainLayout.master. Customer.aspx also contains a UserControl named UC_Details.ascx.How can I have UC_Menu.ascx call a function that is in UC_Details.ascx with this scenario?

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One Trigger A Click Event In A UserControl From The Main Form's Tab Index Control That Contains An Instance Of The User Control?

Jan 5, 2011

The code is listed below which hopefully illustrates what I'm trying to do:[code]....

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VS 2010 : Trigger Event In Usercontrol To Trigger Sub In Main Form?

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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UserControl Access To Public Properties In Another UserControl?

Jun 12, 2011

I have a Windows Form frmMain() holding seven more-or-less unrelated UserControls, ucFlopsy", "ucMopsy", "ucCottontail", etc...I say "more-or-less" because each of the seven UC has three similar public read/write properties:

IsLocked (a boolean indicating if the following two properties are "Locked")
IsLockedID (if IsLocked=True then IsLockedID is an integer)
IsLockedName (if IsLocked=True then IsLockedName is a string)

[code].....

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.net - RaiseEvent From A UserControl That's Placed On A UserControl That's On A Form?

Jul 11, 2011

I have a Windows Form that contains a custom control container as a UserControl. For the sake of this question, this custom control container is called Dashboard. This container called Dashboard contains numerous other controls depending on their permissions. I need to raise events that are contained on these controls through the Dashboard control and over to the Windows Form.

How can I bubble up the event? I'm using VB.NET for this project, but can convert C# into VB.NET.Also, to complicate matters, the main Windows Form is a VB6 project. So, I'm using the InteropFormsToolkit to accomplish this.

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Asp.net - Reference TextBox In One UserControl From Another UserControl

Jan 19, 2011

I have two UserControls on a MasterPage. DataEntryUC contains several TextBoxes and DropDownList. NavSaveUC contains navigation buttons. When the user clicks on a navigation button, I will be saving the data entered into DataEntryUC from the NavSaveUC UserControl.

I have a couple of tables in my DB that contain stored procedure names, control names, control types, SqlDbTypes, etc.... that correlate with DataEntryUC.

How do I reference a text box that is on DataEntryUC from NavSaveUC?

I have been working on the following code from NavSaveUC with no luck.

Dim MyControlName = "txtFirstName"
Dim MyControlType = "TextBox"
Dim MyStringValue as String

[Code]....

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Setting Usercontrol Properties Within A Usercontrol

Mar 22, 2012

I have a usercontrol that has a main form and calls another form within the usercontrol to get some data from a database that allows the user to select some items from a CheckedListBox control on the sub form. I want to pass the selected items from the CheckedListBox back to the main form and display the results there. I have a public property called DBList of type List(of String) on the main user control. If I create a reference to the usercontrol form the second form within the usercontrol I get a new instance of a user control. All I want to do is set the property on the usercontrol and close the secondary form. How do I reference the usercontrol from the form within the usercontrol?

Code in UserControl:

Public Property DBItems() As List(Of String)
Get
Return DBItems

[Code]....

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VS 2010 Load Data Into UserControl In UserControl.Load?

Sep 25, 2011

I just discovered the joys of UserControl's and I was wondering if it is possible to populate the usercontrol with data from a database in the UserControl's Form.Load event instead of the form the userControl is placed on. I feel it would make using the control a lot easier if it just populated itself without anymore code.I tried it with a ListView but it gave me a bunch of errors, so I didn't know if it had to be done a certain way or if it was just one of those things that doesn't work no matter what.

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