VS 2008 Handle Click Event Of Component During Design-time

Feb 10, 2010

I have a UserControl with a Panel (Panel1). The UserControl has a property Items (type ControlCollection) that returns the Controls collection of Panel1.Via a custom CollectionEditor, I tell the designer that it should add my custom controls called Item (inheriting Control). For the sake of example, the Item control is just a control with a random background color:[code]The custom CollectionEditor creates new Item controls using the DesignerHost service (and its CreateComponent method), so that they appear as actual components in Panel1, selectable during design-time just like any other control.It might be a little hard to see (because the colored Items are docked to the top), but I have selected the red item, which can also be seen from the Properties list.

As you can see in the code, I attach a Click event handler to each item as it is added to Panel1. When clicked, a MessageBox shows the color of the item. Obviously this is just for the sake of this example, but the point is that I need to be able to click an item and something then needs to happen.This works fine during run-time. I can click each item, and the MessageBox shows.The problem is that it does not work (quite obviously) during design-time. When I click it during design-time, it is simply selected (as any other control) and of course does not register any Click (nor MouseClick) events.But, I need the Click event to fire even when in design-time! Clicking an item corresponds to selecting it, and when selected (even in design-time), some other panel (not shown in this example) should be brought to the front so it gets visible. Now, I have created lots of things very similar to this (clicking an item during design-time), but there has always been one major difference: those items were not actual controls on the form. Instead, they were drawn manually on to their parent (and they only looked like separate controls). Obviously there was no design-time support for those 'items' (as they weren't controls), but I could handle clicking them quite easily: by handling the MouseClick event of the parent, I can check the location and see if it falls within an item. If so, that item was 'clicked' (artificially).This time, the items are actual controls, and this method does not work (the parent does not receive a MouseClick event either).So, does anyone know of any way to do this? The only way I can think of right now (although I have no idea how to implement it) is to somehow 'listen' to changes in the designer selection.

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IDE :: Component Will Not Render At Design-time, But Works Fine At Run-time?

Jan 30, 2009

using VS2008, targetting framework 3.5I have a rather complex UserConrol which does some of its own rendering.I display this UserControl on a form.Opening that form in the Designer creates an instance of the UserControl in the Designer, which tells me a NullReferenceException is occurring in one of my rendering methods.I have attempted to correct this by making alterations to the UserControl's default constructor, but have not found success.

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Force A Form Or Component To Redraw At Design Time In Visual Studio?

Jun 22, 2010

I have a component which hooks up with the paint event of assigned control and draws on its surface, Whenever i make any changes to the component i need to resize the form or control at design time in order to see the changes.

I want to ask if there is any other way to refresh the contents of a control at design time which forces it to redraw.

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Handle Click Event Of Several Controls?

Jul 22, 2011

I have a mouse click event for one of my controls. I then change the text of that control to something. I also have several other textboxes and want to do the same. How can this be done? I thought maybe this:-

Private Sub txtTitle_MouseClick(ByVal sender As Object, ByVal e As System.Windows.Forms.MouseEventArgs) Handles txtTitle.MouseClick, txtTitle2.MouseClick
End Sub

My problem is how do I determine which has triggered the event (title1 or title2).

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Button Click Handle Event Does Not Work

Jul 25, 2011

I have this code in ButtonClick Handle event but nothing works :/ I was wondering why... I tried msg("") as well as the first line in the code to see if it works but nothing!

Dim myConn As SqlConnection
Dim cmd As SqlCommand
Dim sqlString As String

[code]....

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Why Can't A Sub Implement An Interface And Handle Event At Same Time

Apr 12, 2011

Why can't a sub implement an interface and handle event at the same time? The following gives my a syntax error:[code]I know I could handle this kind of logic with another method, but that is not the point. I just want to understand the reasoning behind this.

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ASP.NET: Handle A Click Event From A <a> Element Within A Literal.text?

Feb 9, 2012

I'm creating <div>'s and appending them to a literal's text property. I have added a <a> element to the text so that the user can click on a specific element. How can I tie that to a function to handle the event in the codebehind (vb.net) ?

Example of my Literal.Text ...

For Each row As DataRow In oDataTable.Rows
MyLiteral.Text &= "<div style='font-size: 8.25px; text-transform:uppercase; padding:3px; background: #FF8C00; border: 1px solid #000; margin: 0 5px 0 5px; display:inline-block; float: left;'>" _
& row.Item("LastName") & " | <a href='#?"& row.Item("ID") & "' style='color: #000;' >X</a></div>"
Next

So the above code I want to somehow allow the user to click the X link and then it would remove that person.

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Forms :: Load Event Only Fires One Time (Loosing Handle)

Jul 17, 2011

I have a form for which the form load event only fires one time. When the program starts. It will not fire again until I end the program and restart. I have tried .show and .showdialog, but it acts the same. I have read about form load events loosing the handles, but my code looks exactly like it should.

Here is the load event code
PrivateSub frmBilling_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) HandlesMyBase.Load
LoadClients()
LoadTherapists()
LoadCPT() EndSub

Here is the code that calles the form.
PrivateSub BillingToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles BillingToolStripMenuItem.ClickfrmBilling.Show()
frmbilling.show()
EndSub

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Joystick Handle - Use Only The Handle Of The Component?

Mar 23, 2009

I wrote an application to handle a joystick with directinput. It works fine if it uses the handle of the main window but it doesnt happen the same if the handle is the one of the component that contains the joystick's operation.

I mean:

main form handle: 15

component handle (which is inside the window and the joystick needs the focus of this component to work): 25

It always work if the handle i initilizate the device is the main form (15).How can i use only the handle of the component?

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VS 2008 Using More Event Handlers To A Handle The Same Event?

Mar 6, 2011

is it allowed to use more than one Sub to handle the same event ? For example , may I have 2 separate subs to handle the Load event of a form ? Will they fight each other ?I have tested it and it seems to work fine , nevertheless I thought I'd ask you . In case you wonder , there is no great deal , I just want to copy the same lines of code in more forms so I am doing it just in favor of the looking aspect .

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In Button Click Event How To Export & Delete File At A Time

Jun 9, 2011

in windows form in button click event how to export the file in a location select by showdialog & it will be delete permanently at a same time.How can i do this!
because in .net it will produces error "IO Exception was unhandled" or "The process can not access the file because it is used by anather process." .In button click event how to export the file & delete at same time in vb.net windows application.

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In Button Click Event How To Export & Delete File At A Time In VB

Jun 9, 2011

n windows form in button click event how to export the file in a location select byshowdialog & it will be delete permanently at a same time.How can i do this! because in .net it will produces error "IO Exception was unhandled" or "The process can not access the file because it is used by anather process." .In button click event how to export the file & delete at same time in vb.net windows application.

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VS 2008 Custom Treenode At Design Time

Dec 22, 2010

I'm currently working on a treeview but want to add custom nodes at design time, is this possible?Also the treeview is part of a control, so i have created a control designer and added a custom design time form to add my custom nodes, but can't seem to get the nodes into the treeview in design time, and serialize into the form automatically?All my custom tree node is is an extra integer at the minute, but more properties will be added later if I can get this working.

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VS 2008 Hide Components At Design Time

Nov 25, 2010

OK maybe this is completely silly question that everyone knows the answer to but me! Is it possible to hide a component while in design view? e.g. I'm working with multiple components that overlap and would just like to be able to view/work on one at a time. Have I completely missed something or is this not possible?

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VS 2008 : SQL Query - Works At Design Time But Not Runtime?

Aug 16, 2010

I've created an SQL Query using the query builder. In the query builder, you can test the query by clicking the button "Execute Query", and entering the desired values in the parameter fields.

My query returns the correct results when I do this, but when I seemingly pass the same values at runtime, I get 0 records returned.The query is designed such that you can pass nulls if you don't wish to filter data by that particular parameter.
SQL Query:


SELECT ID, UPC, Quantity, Manufacturer, Style, Color, Size, Category, DateReceived, Cost, OriginalRetail, Retail, LocationID
FROM Inventory
WHERE (UPC = @UPC OR

[code]....

In the query builder "Execute Query" dialog, I enter a value I know that the db contains in the "Size" field, "1/1/1900" & "1/1/2199" in Dates A & B, respectively, and nulls for all other fields. This returns 1 record, which is just as I expected. It works correctly.But when I pass the same values into the method created by the designer, I get 0 records returned. I can't figure out where the problem lies. Even if I enter nulls for all fields other than the dates, it returns 0. This tells me that the dates are causing the problem, but I can't figure out why, because I'm passing strings equivalent to what I entered in the query builder.

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VS 2008 Make Control Freeze Like Design Time?

Jun 12, 2009

Can we make the Combo Box not drop down if we click on it even though it have item in the list, button not click-able even though it have the on_click event..textbox not allow to set focus but not in disable mode...everything like design time.. because I want to do drag and drop control like visual studio.. but I can drag now, just when I want to click the control to drag, the control still remain the default function...

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VS 2008 Prevent Re-size Of A Control At Design Time?

Sep 26, 2011

How can i do this ... by the propper way i mean so that the grippers don't even display - like they do with an auto-sized label, or a non-multiline textbox.

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VS 2008 Handle Same Event For All Of That Object Type?

Sep 12, 2009

Say I have a button that creates more buttons with a random .Text property, and placed them on the form in different locations. And since these buttons are being created at runtime, I want to be able to have an event handler for all button controls on the form that makes the form's text the same as the sender's text.

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VS 2008 How To Handle A Groupbox Rightclick-event

Sep 10, 2009

Is it possible to handle a groupbox rightclick-event in VS 2008? I want to display a dropdown menu when my groupbox is rightclicked, but it seems that a groupbox doesn't have a click-event... Is there a way to make this happen?

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Export & Delete File At A Time In Windows Application Through Button Click Event

Jun 9, 2011

in windows form in button click event how to export the file in a location select by showdialog & it will be delete permanently at a same time.How can i do this! because in .net it will produces error "IO Exception was unhandled" or "The process can not access the file because it is used by anather process." .In button click event how to export the file & delete at same time in vb.net windows application.

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VB 2008 - IDE - Cross Hatched Lines On Tab Control At Design Time

Apr 20, 2009

I recently made some changes to my VB 2008 application, and now there are crosshatched lines throughout parts of my tab-control at design time. When executing the application everything looks fine, and there are no errors generated. Why has this happened?

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VS 2008 Inherited Control Firing Properties At Design Time

Jul 16, 2009

I've written my code to implement a new property and to set the content to this default text and grey the text whenever the textbox is empty, and to hide it when the user starts typing. This all works fine at runtime.[code]My question is this : If I place an instance of the control on a form, and set the DefaultText via the properties grid, why doesn't my Property Set code run?I'd expect the control on the form to show my new DefaultText in the control, but instead it remains blank. When I run the form it does display correctly, but just not at design time. I place a breakpoint in the DefaultText set property code and it simply doesn't run.

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[2008] TabControl On UserControl - Adding Tabs (Design-time)?

Dec 2, 2008

I have a TabControl on a UserControl. I want the UserControl to behave like a TabControl as usual (it contains only the TabControl and a Contextmenu), including Design-time behavior.I have spent the last two weeks finding out how to add the Design-time behavior and I think I have come a far way.The problem is with adding TabPages during Design-time (while the UserControl is a custom tabcontrol, it is using regular windows forms TabPages).In the Designer class, I have the following code to add a TabPage:

vb.net
Dim dh As IDesignerHost = DirectCast(GetService(GetType(IDesignerHost)), IDesignerHost) If dh IsNot Nothing Then Dim i As Integer = tc.SelectedIndex Dim name As String = GetNewTabName() Dim tab As TabPage = TryCast(dh.CreateComponent(GetType(TabPage), name), TabPage) tab.Text = name tc.Controls.Add(tab)

[code]....

So it would add the control to the TabPages collection if it was a TabPage, and use the regular routine otherwise.

(I'm now using 'tc.Controls.Add(tab)' again instead of 'tc.tabCtrl.TabPages.Add')

But, I don't think the designer even gets that far because it is telling me I cannot add TabPages to my usercontrol, because only TabControls can accept TabPages... How can I make my usercontrol understand that it is a TabControl (without Inheriting from a TabControl?)

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VS 2008 Call Procedure To Handle All Control.click Events?

Jul 27, 2009

I am trying to make a routine that will be called everytime the mouse button is clicked. I want it to be called so that the controls event that the mouse is clicked on is triggered.

For example:

You have a button control on your form. Instead of having the Button1_click event

You have a Control_click event. And that Control_Click event will be used for each control on the form.

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VS 2008 - Handle Leave Event For Multiple Textboxes

Aug 23, 2011

Is there another way to handle the leave event of multiple textboxes other then coding in each event handler? I may not be using correct terms instead of doing this: (Existing)
Private Sub leveladjstvaltxt_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles leveladjstvaltxt.Leave
If Me.leveladjstvaltxt.Text <> "" Then
Dim levels As Integer = CInt(Me.leveladjstvaltxt.Text)
Me.leveladjstvaltxt.Text = Format(levels, "#,###")

I have 30 TextBoxes all need same formatting , so I was trying to come up with something like this: (trying)
For Each ctrl As Control In Me.Controls
If TypeOf ctrl Is TextBox And ctrl.Text <> "" Then
Dim val As Double = CDbl(ctrl.Text)
CType(ctrl, TextBox).Text = Format(val, "#,###")
End If

I am stuck though and don't know where I would place that code if this is something that is even possible. Only thing I can currently think of is in the leave event which defeats the purpose, I wanted to avoid having to place the code in 30 different textoxes leave event.

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VS 2008 Possible To Click Or Double Click On A Bubble And Do An Event?

Mar 17, 2009

[code].....

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Component Display Error In Design Mode?

Jul 20, 2010

Im using VS 2010 Trial edition. In my web application i got error "error hresult e_fail has been returned from a call to a component" while viewing the aspx page in design mode.

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VS 2008 - Can Data Binding To Object Properties Be Setup During Design Time

Feb 17, 2010

Im doing my first project with WinForms, and Im trying to get the DataBinding working. Theres no database in my project, but I'd like to bind some of the TextBoxes to objects' properties. In the other section of this forum (here) I found this line of C# code which does it: textBox2.DataBindings.Add(new Binding("Text", this.myPerson, "LastName"));

my question is can data binding to object properties be set up during design time (without writing code)? If so, how? P.S. I know how I would set up this binding if in WPF, but I'm forced to use WinForms.

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VS 2008 Adding ToolStrips To A Container During Design-time (via Collection Editor)

Oct 28, 2009

I am trying to extend the functionality of the ToolStripPanel control (which is a panel hosting ToolStrips that can be moved during design-time, as I'm sure you know).One thing I wanted to add was a 'ToolStrips' property, which would be a collection of ToolStrips the user can edit via the collection editor in the designer. So instead of manually placing ToolStrips on the ToolStripPanel via the toolbox, the user can just use the property to add/remove (or even edit) them. This is of course similar to how you add/remove/edit TabPages in a TabControl.So, I came up with this code, which I have used successfully in the past for other controls:

Public Class cToolStripPanel
Inherits ToolStripPanel
Private _ToolStrips As New ToolStripCollection(Me)[CODE]....

The cToolStripPanel control inherits the ToolStripPanel control and adds the ToolStrips property, which is of type ToolStripCollection. That class, in turn, inherits the Collection(Of ToolStrip). In the InsertItem method, I add the 'item' ToolStrip to the cToolStripPanel. Of course I also need to override the RemoveItem / ClearItems methods but that's for another time.I am 100% sure that this code should works, at least for other controls. If you replace ToolStrip with Button (for example), I can add buttons via the property during design-time just fine, exactly the way I want it.But it seems that ToolStrips are special. When I try to Add a toolstrip (via the collection editor Add button), a null reference exception occurs. I've been trying to debug this all day and I've finally come up with a possible candidate for the problem... (I've actually used design-time debugging for the first time ever, which was pretty cool, and which showed me that the InsertItem method is not run!)

I think the problem is that the collection editor cannot create a new instance of the ToolStrip class. I can remember when trying to inherit from the ToolStrip, I was forced to add a constructor, because the ToolStrip "has more than one constructor that can be called with no arguments".Perhaps this is causing my problem? Do I (and if yes, how?) have to somehow control the creation of a new instance of the ToolStrip? Or am I completely off track and that is not what is causing the problem? I'm sure that it's a problem with the ToolStrip class, since I can use the exact same method with other controls just fine. It's only when I change the type to ToolStrip that it starts getting angry at me....

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VS 2008 : Handle The Event Of When The User Checks/unchecks A Checkbox?

Jan 17, 2010

I have a ListView object with the View property set to Details.I also have the CheckBoxes property set to True. Now, how do I get the user's input if they choose to check a box? Right now I am using the ItemCheck event, but that code runs even when I add something to the ListView object.What is the proper way to handle the event of when the user checks/unchecks a checkbox?

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