Find Out What Triggered An Event
Jul 30, 2011
I'm having a really annoying issue which I can't get to the bottom of. I've got a NumberUpDown control which has a ValueChanged event. There is only one reference to it in my entire project which I have commented out to prove that it isn't calling the event. Even though the number is not being changed (the control sometimes isn't even in focus!) the ValueChanged event gets called. This is driving me crazy and I wondered if I could back track through the code to see what actually caused this event to trigger?
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Sep 18, 2011
I have a datagridview control with a number of comboboxes on it.I am generating a custom combobox with a DataGridView_EditingControlShowing event.How do you get the name of the combobox in DataGridView that fired the event?as all actions on the DataGridView trigger this Sub
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Jul 20, 2010
I'm trying to validate a few things in a form I'm building. It has a datagrid with clients info (taken from an access database) and a few textboxes where the user can type some search criteria. The thing is that those same textboxes are used to add new clients to the database and to modify a client's information if one from the datagrid is selected, so I made it that the buttons to insert and modify clients are disabled on load and thenevery time the text on a textbox changes ("TextChanged" event) they become enabled. So far so good. But then I wanted to make it so when a client from the datagrid is selected both buttons become disabled again until the text on a textbox changes (to make sure they're adding a different client and not the same one that was
selected).
I tried using the CellClick event from the datagrid to disable the buttons, but since every time a client is selected from the datagrid the info is shown on the textboxes, this triggers the TextChanged event too, and the buttons become available.So, is there a way I can tell the TextChanged event not to be triggered when the CellClick event occurs?
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Feb 12, 2010
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?
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Jul 18, 2012
Following on from my post yesterday (how to anchor buttons/controls to various sides of the current form when the form is resized) I have run into another problem. I am setting the width of my datagrid to be 80% of the form width on a 'form resize' event with 10% of the width at either side so it remains centred in whatever size window is available. This works fine. (mydatagrid.width = me.width/5*4)
I then decided to dynamically set the width of the 2 columns in the datagrid each to 50% of the width of the datagrid. Again, this sub is called in the 'form resize' event. This fails because the datagrid hasn't loaded the data from my sql database when the first 'resize' event is triggered. I did a bit of testing (by placing a simple msgbox statement into the resize event and the load event) and it seems the 'resize' event is triggered three times before the form's load event.
how do I stop the resize event triggering when the form loads (or at least make the load event trigger first).
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Jul 13, 2011
i have used a aspx page with vb code. the page is not firing any event after some time if the page is kept idle.
any property needs to set in page attribute??
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Sep 28, 2009
I am using VS 2008 and UltraGrid from Infragistics v 5.2
I have two UltraGrid objects on a Winform. While the AfterRowUpdate event gets triggered for one, it does not get triggered for the other. Here's the procedure of the offending UltraGrid event:
This does get executed:
Private Sub ugPatient_AfterRowInsert(ByVal sender As Object, ByVal e As Infragistics.Win.UltraWinGrid.RowEventArgs) Handles ugPatient.AfterRowInsert
e.Row.Cells("Courtesy_C").Value = "Mr."
[Code]....
The source file is different from when the module was built. Would you like the debugger to use it anyway?
Even if I rebuild by application, the dialog box does not go away.
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Dec 20, 2010
how can i know what event was triggered in picturebox in VBnet? [Code] i want to know what event was triggered whether it is .MouseEnter or .MouseLeave. the reason why i'm making this is to make the code more categorized according to the object that was used.
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Apr 15, 2012
What event trigers when we open file with our exe/program? How to do coding for that?
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Aug 17, 2010
I am facing a issue while using the "validating" event of the maskedtextbox. I have an MDI form, in which there is a main form and a form acting as bottom bar. The bottom bar comprises of buttons for moving to "previous" and "next" forms. If suppose in the main form i have a maskedtextbox and the initial focus is set on it, then on the click event of the button (next; which is on the bottom bar form), it calls the validating event of the maskedtextbox twice. In the validating event of the maskedtextbox, i am checking some validations and if it doesnt pass, then i set [e.cancel = true]. just let me know the reason behind the triggering of "Validating" event twice?
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Aug 12, 2010
I have a textbox in a tab control and iv'e coded the textbox_leave event to show a msgbox and reselect the textbox if the text doesn't meet certain conditions.
Private Sub TextBoxChaseTime_Leave(ByVal sender As Object, ByVal e As System.EventArgs) Handles TextBoxChaseTime.Leave
If IsDate(Me.TextBoxChaseTime.Text) Then
Me.TextBoxChaseTime.Text = Format(CDate(Me.TextBoxChaseTime.Text), "hh:mm")[code].....
(Reselecting the textbox is the only way i can find to efectively cancel the leave event - is there another)
I've also added a line to also reselect the tabpage incase the textbox_leave event was triggered by selecting a different tab in the tabcontol.However, when the textbox_leave event is triggered by the user selecting a different tab the textbox_leave event seems to be triggered several times displaying the msgbox four times.why this is, but it seems to be caused by the by the line that reselects the tabcontrolhow to stop the msgbox being shown more than once Interestingly, if i add a line to change the text in the text box to meet the conditions the msgbox is only shown once, but the tabpage is not reselcted
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Mar 23, 2009
I have created the following piece of code to try and see if the user pushes the 'f1' key, and if they do.
[Code]...
I am not sure if this code works yet because the keypressed event is not triggered when I push a key. Could someone tell me how I can change my code so that it will test what key is pressed, no matter what control on the form has focus?
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Nov 15, 2010
I have a picture box in my form and now I want to add an event so that if the mouse is scrolled up the scale of the picture box gets larger and when the user scrolls down the size off the picture box gets smaller. This way I want to make a zoom in and out effect.So now i have the following code in the mouse wheel event of the Picture box:
If
e
.
Delta
>
[code]...
But somehow this whole mouse wheel event isn't fired.
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Mar 25, 2011
I have an application with a DataGridView and WebBrowser controls. In the DataGridView I load a DataTable using BindingSource. DataTable is just a list of URLs. I use SelectionChanged event on the DataGridView to load a selected URL in the WebBrowser control. The problem I have is that when I minimize form to the tray, it for some reason triggers SelectionChange event multiple times. What's really weird is that if I minimize to the taskbar SelectionChange event doesn't get triggered. It also doesn't get triggered if I load URLs directly to the DataGridView. What triggers SelectionChange and how to get rid of it?
Public Class Form1
Dim URLTable As DataTable = New DataTable("URLs")
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Dim URLColumn As DataColumn = URLTable.Columns.Add("URL", GetType(String))
[Code] .....
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Feb 3, 2011
Let's say I have a DropDownList of product categories and a ListView of products based on the category selection in the DropDownList. When a user visits the page, there is a possibility of conconrency issue as new product belonging to a new category may be added to the inventory as the user is browsing.When the user selects a different category to view(a SelectedIndexChanged event) and causes a postback, I want the DropDownList to update the list of categories to include the new category being concurrently added and at the same time still able to make a change of selected index.
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Feb 5, 2009
About some coding in visual basic.NET 2005. I was wondering if it was possible for code to be altered automatically if a certain event was triggered. For example; would it be possible for you to alter the following structure, say if a a button was pressed?
The structure is as follows:
Structure ClientDrawings
Public ClientID As String
Public Drawing_1 As String
[CODE]...
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Jun 15, 2009
In an event handler of a tab chaged of a tabcontrol, I call a method asynchrounously, like this:
Private Sub tabDetails_Deselecting(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TabControlCancelEventArgs) Handles tabDetails.Deselecting
' we pass pageindex so that we set the index back in case the validation fails
[code].....
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Jan 16, 2009
When you Use Socket.Send Ether in VB6 with the Winsock control or Vb.Net sockets / Windows API does it generate that if you send "Hello" that on the other side it will get the Full Message Before the Data Arrival event is triggered??Or is it possible it can get it in two Different events like "He" & "llo" and a Last question, TCP is stream oriented, is there a Protocol that is Message Oriented but is wrapped with TCP, if not what is a good Delimitor to use with TCP, Usually ide use &H1 OR &H0 but I assume &H0 is common.. or Should I just add a Length Param before each Packet I send..?Now if thats the case and I got the Delimitor route... What if Im sending Chunks of 8192 of a File in a while loop and on a different thread I send a Command if I use the Length Param isent there a huge chance that the messages will get sent like this
[code]...
BUT the issue lies as it thinking that only the 3 of 4 of the incomming file Frames are getting Recv due to it not knowing which frames are for which. Mainly due to me sending a big burst and on the other side recving random chunk sizes on the other side.Edit: Got another question, If I send two bytes across the internet via TCP, will they ever arrive as two different I belive the term is Frame or is that only when they exceide the size of the MTU will the Message be Split. The reason why is if I send a Header saying SOH, Length Of Message(2Bytes), thats 3 bytes can I say 100% of the time the computer on the otherend will recv that all at once so I can parse it? And What ever happen to Flush for Winsock?
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Mar 3, 2011
On my DataGridView one of the columns is set to a ComboBox. When I make a selection from this ComboBox the CellValue change Event is not triggered. What event is triggered when I do the selection?
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May 9, 2010
I'm not even sure what I need to know. None the less lets say I got a timer with an if event to check if said event is triggered then it fires off some code. The problem is if said event is triggered it keeps firing off the code and I only need to do it one time. Whilst letting the timer keep checking if event happened. I hope I worded that right and here is a rough translation in code. [Code] Is there a way to keep checking if an event happened and only fire off the code one time?
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Apr 15, 2010
if a new value of Calendar is selected, it would trigger .SelectionChanged event, but what if same selected value is clicked again? How should i identify it uniquely?
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Jul 8, 2010
What did I do wrong below? When I pass the enter key but for somehow the enter key event doesn't get triggered.
CODE:
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Mar 6, 2012
I'm having a problem with the treeview I cant find a way to find the click event in each child nodes Here's a sample image here's what Ive tried so far.
[Code]...
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Dec 20, 2011
I'm following this exampleto build an editable GridView control.I have this code in my GridView:
<asp:TemplateField HeaderText="Negócio">
<ItemTemplate>
<asp:Label ID="lblNegocio" runat="server" Text='<%# Eval("Negocio") %>'></asp:Label>
[code].....
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Apr 25, 2009
I have a program nearly completed that visits a web page, clicks a button, and goes on. My only problem is, I cannot find out to add the document completed event in a loop. Basically, it visits a web page, was the document completes loading, it clicks a button, but I can't find how to make it loop.
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Apr 12, 2009
In my attempts to understand vb.NET, one of the problems I have encountered is that I have not been able to find a concise definition anywhere for the Paint Event. So after many hours of researching and forum posts (and my own personal tests), here is my own definition (but it seems to fail in one instance, mentioned after the definition). I would like to create a final definition based on everyone's input, but keep in mind, the idea here is to STAY CONCISE. So here goes:
Explanation of the Paint Event
Whenever any portion of a control is UNCOVERED (except by the mouse pointer), the paint event fires. Covering of the control does not fire the event, because the covered area is not visible to the user, and is therefore irrelevant. The paint event is a messenger that alerts the program, via message, that some portion of the control has been uncovered and this message launches an OPTIONAL paint event handler (paint event procedure) written by the programmer, if one is needed to handle those situations when the event occurs. One possible situation is the most obvious...the need to redraw the uncovered region. A paint event procedure is the programmer's counterpart to vb6's automatic property, "AutoRedraw". But whereas vb6's solution was a simple and automatic redraw of the control, vb.NET's equivalent requires the programmer to define explicitly how the event is to be handled, whether it be a simple redraw or something more elaborate. This puts this event in a special category; it is not a user-desired event fired by some user-desired action...it is an internally generated event that acts more as a housekeeping "watchdog" to alert the program that housekeeping chores may have to be implemented because the user did something that was NOT DIRECTLY RELATED to a desired action. For example, when the user moves a window over a control in such a manner that a portion of the control is covered, then uncovered, this causes the state of the control to change even though the user did not specifically request it. It nonetheless may have to be dealt with, and this is managed via the paint event handler procedure.
The problem I have with this definition of mine, is that if the above is true, then why does the mouse moving across the control NOT cause the paint event to fire? After all, it is causing areas of the control to be covered and then uncovered. Is it because the mouse is a special case where the system puts the mouse pointer on a separate layer above the screen graphics, in order to prevent constant paint event messaging?
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Apr 7, 2011
I'm having a problem with the treeview I cant find a way to find the click event in each child nodesHere's a sample image
here's what Ive tried so far.
Private Sub TreeView1_AfterSelect(ByVal sender As System.Object, ByVal e As System.Windows.Forms.TreeViewEventArgs) Handles TreeView1.AfterSelect
[code].....
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Oct 19, 2009
even Word Pad, when you scroll your Caret (the I-beam for browsing through text) through the text, in the font combobox, the font of the text you are browsing through will be displayed, and when you scroll your caret through a different font, the font will be changed. If you're confused, look at attatched picture.
I cannot seem to find a caret position changed event on the normal richtextbox control - and if anyone can show me a custom component with this it would help me a huge amount.So my basic question is how can i replicate the formentioned function in my own VB.NET program.No code is necessary just constructive suggestions, or links to other projects would be welcome. You don't need to quote the forum rules
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Feb 14, 2011
I have a HTML page which i am converting it to DOM and in tat i am calling a function, which will find the click button in the DOM and trigger the click button. But for some reason my code is unable to find the control.[code]...
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Aug 21, 2009
is there a way to trigger a MsgBox by clicking a button within a If and End If paragraph?
Public Class Form1
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
[Code].....
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