C# - Difference Between Load Event,Activate Event And Enter Event In The Form?

Mar 30, 2009

I am using VB.NET for Windows applications. What is the difference between Load event,Activate event and Enter event in the Form and in which order the above event is executed.


How To Force Form Load Event On Form2 From Click Event On Form1

Nov 16, 2010

I'm trying to execute different code depending on the button clicked (button 4 or 5) on Form1, but when I click on button5 to activitae the code on the Form2's Load event everything is Ok, but when I click the back button to return to Form 1 and click on the Button4 to activate the code on the Form2's Load event again, it doesn't active the Form's Load event, is there a way to form the form load event every time I access it from Form1? [code]

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Enter Key Event - When Pass Enter Key But For Somehow Enter Key Event Doesn't Get Triggered

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.


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Forms :: Set Listbox Checked On Load - Activate - Shown Event

May 17, 2009

I've been having a problem setting certain items in a listbox as checked when the form is loaded. I have tried putting the code in the form_activate, form_load, and form_shown events and each still crashes when it encounters:


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Difference Between The SizeChanged Event And The Resize Event?

Feb 16, 2010

What's the difference between the SizeChanged event and the Resize event?

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MDI - Form Activate Event Not Firing

Jul 22, 2011

I am using VB.Net for my Windows application. I will open two child form from MDI. Both forms will open. Now if I will go from form1 to form2 then Activate event for form2 will not fire.

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Activate Form On MouseEnter Event Not Working

May 25, 2010

I'm trying to make my application become the active window if it currently isn't as soon as the mouse enters the main form of the application (so there is no need to click the title bar of form itself to make the window the currently active one if it's not).

It only sorta/kinda work .... I have to enter the form with the mouse 3-4-5-6-maybe 7 times ... then the window finally becomes the active one.

I know the MouseEnter event is firing each time the mouse enters the app, but the main window isn't becoming active most of the time.

Private Sub frmMain_MouseEnter(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.MouseEnter
rtbStatus.AppendText("Just got a frmMain.MouseEnter event" & vbCrLf)


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Does Pressing "Enter" Activate The LostFocus Event Of A Textbox

Jun 28, 2009

how to capture the text that a user enters in a textbox when they press the enter key? I thought there was an event that handles this but I can't quite seem to get anything to work.

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Difference Between Key Press Event And Key Down Event?

Jun 14, 2011

what is the difference between key press event and key down event in vb.net.

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Resize Event Triggered Before Load Event

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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Control Array - Add New Event - Click Event Code And Calling It A Doubleclick Event

Jul 31, 2010

I've read thru Iceplug's tutorial on control arrays and got it working. I tried to add a new event by basically copying his click event code and calling it a doubleclick event. I used the proper addhandler and assigned the correct name to my sub. I have the click event changing the background color to blue and the doubleclick event changing the background color to green. The background color does not change to green. Why?

Heres the tutorial with my new code encased in asterisks ...


Imports System
Imports System.Windows.Forms

Public Class form1


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Override An Event - TextChanged Event Not To Be Triggered When The CellClick Event Occurs?

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

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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.Net Form Activate/Deactivate Event Firing Issue After Removing A TabPage From TabControl?

Nov 28, 2011

I've recently run into an unexplainable issue regarding a windows form application I am working on.  I've managed to isolate the issue to a single line of code whereby a single TabPage is removed from a TabControl, leaving no tabs left in the TabControl's collection.  What happens next is a bit mystifying: my application proceeds to enter a state in which the main form's Activate event is fired subsequently followed by its Deactivate event.  As a result, no matter where I click on the form, the application will activate for a split-second then immediately deactivate itself, thereby causing me to be unable to interact with any other GUI controls on the form.  I thought maybe another thread is trying to interact with the deleted tab object, but the tab is created and destroyed on the same main gui thread. Does anyone have any insight that may point me in at least a new direction?  Stepping through the debugger to the point in code where the tab is removed does not cause any exception to get thrown, so at first glance there doesn't appear to be any coding issues going on (although I would not be surprised that is actually the case!).

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Event Argument For The Form Click Event Has The Type "TimedEventArgument"?

Dec 23, 2009

As you noticed, in the code bellow, the event argument for the form click event has the type "TimedEventArgument".When the event is raised, e.Time holds the time where the form was clicked.Add the missing code in the class Form1 to make this work.You will not change anything to the methods "Form1_Click" or "Form1.Load".You will not use Option Strict On.  HOWEVER, you will not do any narrowing or late binding that wouldn't have been allowed if Option Strict was on.You cannot create any new Class, Structure or Module.You cannot cast the EventArgs to TimedEventArg in any way


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Difference In Mouse Hover And Mouse Enter Event In Regard Of .net?

Mar 27, 2011

I have two questions in my mind!

1) What's the difference in mouse hover and mouse enter event in regard of vb.net?

2) Is embedding a resource in application more efficient or linking it on compile time?

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ADO .NET Equivalent Event To MS ACCESS Form's OnCurrent Event

May 11, 2009

I just want to know if there any equivalent event (ADO. NET VS 2008) event as in MS ACCESS Form's OnCurrent Event.

The reason is I like to make some calculations based on some data bound controls with current datarow data when user clicked a row in DataGridView (or by using bindingNavigator). I've tried with DatagridView's RowEnter event. But some Data bound controls are not yet reflect the data of current datarow when that evet was fired.

In MSDN Help File: It says "RowEnter Event: Occurs when a row receives input focus but before it becomes the current row. "

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Can't Use Form Mouse Move Event Or Any Other Control Event

Dec 6, 2011

How should I go about getting my mouse position over multiple controls, and such. I can't use the form_mouse move event, or any other control event nor can I use them all at the same time cause that would conflict with the actual position I need for an object.

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Form Enter - Login Button Click Event

Feb 24, 2010

I have a login for with a username and password box, it also has a login button. When a user has finished entering their username and password and they hit enter (without having to click the login button) it does the loginbutton click event code.

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How To Activate Event From Somewhere Else

Apr 14, 2011

I am creating a web browser in VB 2010. I have a search box, and I want to make it so that when I press enter in the text box, it searches. [code] The problem with this is that when I press enter, there is this annoying "beep". I don't know where this comes from. The only thing I can think of doing is making the event activate the search button, but I don't know how to do that either. How can I fix this?

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What Happens Before Form Load Event

Dec 21, 2011

I have a form and initialize some global variables on its Load Event. There is a TextChanged event in one control (a textbox) that uses that value. The TextChanged event of the control is triggered before the Form's Load event even if I do not change anything on the TextBox, it looks like that happens when the control is loaded. Why is it doing it before the form? and what event can I trap in order to assure it's the first thing that happens?

Its as simple as this:

Private Sub PackOutMain_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
ActiveFlag = False


My guess is that the msgbox should not appear until the flag is set to true somewhere in the code and then change the contents of txtUser, but it is shown before the form.

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Activate() Not Working In Deactivate Event?

Jul 23, 2010

We have a VB 2 VB.Net migration MDI application , we have a messagebox in Deactivate event ,once you click Ok for Message Box ,the focus must be set on to the Child Form which is active.


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Event That Fires After Form.Load?

May 12, 2010

I'm looking for an event on a form that fires after Form.Load. Specifically, after the form has been displayed. Is there one?

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Form Load Event - How To Kill EXE

Apr 3, 2009

I am writing a program in vb.net I have to call an exe(printstatus.exe) in form load event. I successfully called exe. But I don't know how to kill that exe (printstatus.exe) when an user is logged out.

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Form's Load Event Not Called?

Apr 25, 2011

I was having a problem with the debugger not stopping at breakpoints. After a lot of work that yielded no results, I realized that the problem was occuring in the form's load event and subs called from that event.

The problem is that it appears that the load event is not being called. Other startup forms in other projects in the solution seem to be working ok.

what could be keeping the the Load event from working?

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Load Event For Form Error

Mar 8, 2011

I have the following code in the Load event of my form and the 3rd statement obviously fails. My question, why does the code fail and not tell me about it? In other words, it fails and then simply displays the form without crashing. It also doesn't execute my 4th statement.[code]...

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Set Focus In Form Load Event?

Jan 14, 2012

I write a code in My Form Load event as:


But it is not focus in my txtpassword textbox . i focus 0 index txtUsername textbox. How i define to focus a control when form load

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VS 2010 Event Before Form Load?

Apr 30, 2011

so I have the following

Dim username as String = My.Application.CommandLineArgs(0)
Dim password as String = My.Application.CommandLineArgs(1)
Msgbox("Cannot launch")
Exit Sub
End Try

I placed this in the form's load event. What I want is for this check to run before the form even loads.If an error occurs, the msgbox comes up and the form is never seen. When I try the code now, the form comes up the msgbox shows. When the user clicks OK the form closes. I tried placing it in the form's designer but the designer tries loading the form any way. How do I get this check to run before the form shows?

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VS 2010 Form Load Event In .Net?

May 2, 2010

I am making the Transition to VB.Net (using VB.NET 2010 express) and I have a simple problem that is driving me crazy. I wish for my Form when it Loads, initialise and then call a sub and do some stuff eg perform a plot. If i place a button on the form and click it the sub works fine.This task was simple to do in VB6 but for the life of me I cannot get it to work in VB.NET. Has the Form-Load event changed in some way with .Net?

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VS 2010 Form Load Event?

Mar 6, 2012

I have a calculation project with 6 forms. The last form shows all the input and output data from the previous forms. This is accomplished in form6 load event. Form6 contains about 40 controls (mostly textboxes, labels and few pictureboxes), populated in this way:Textbox1.Text = Form2.Textbox3.Text, etc.I am not sure if this is a good practice. I know I can use the DGV, but it does not suit me because of the graphical reasons.

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Way To Trigger An On-load Event On One Form From Another?

Mar 8, 2012

I have one form (FormA) that fills a combobox with data when the on-load event is trigged.In that combobox, I can select "New value" which opens another form (FormB) on top of FormA.On FormB I add the new data and saves them to a Database.Everything OK till here.I then close FormB.... and return my attention back to FormA.Now I would like to reload data into the combobox, but everyway I have tried, it will not work.

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Why Load() Event Of One Web Form Effects On The Other

Jul 5, 2009

I have a web form called "AdminHome" in it in the Page_Load() i have added


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Create A Timer That Will Activate A Tick Event?

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


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Last Activate Control - Event Leave Calls Another Sub?

Nov 30, 2010

MSDN brings nothing up, so here was my attempt at a work around.


Because event leave calls another sub i need the last active control. I have the textbox name txtTime{0} but obviously string is not a control.

So Two questions:

1) can a string value be attached to an existing control if i know it's name? Dim attControl as Control = newTime

2) All this could be avoided in event leave if i could get the left controls name. I have tried sender. tostring etc but nothing returns the textboxs name

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Execute The New Class From The Form LOAD Event?

Oct 25, 2010

I want to develop a program using VS 2010 Pro, VB and .NET 4.0 to run on a Windows standalone computer.The program will be loaded by another program that checks for a text file in a directory.When that file exists, the program I want to develop will be started and it will process the text file.The new program will not have any buttons or dialog boxes, it will simply display the progress of the processing of the text file and then it will simply terminate and exit.

I know I can start the processing by putting code in the LOAD event for the form, but i want to make a new class for all the processing to start from and have the new class perform all of the steps necessary to complete the processing of the text file.Of course this new class will use other classes to do all of the different processing steps.How do I execute that new class from the Form LOAD event?

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Auto-scalemode And Form Load Event?

May 8, 2012

What I have found is that ifAutoscalemode is set to DPI or Font, the form Load event is raised during the form constructor (sub New). When autoscaling is not active, the form Load event is not raised until the form is displayed (Show method).This change of event sequences caused various errors from code I had in the Load event for various forms because the controls on the forms weren't completely initialized.  I have worked around the errors for the most part so it isn't much of a problem anymore but it is forcing me to change some coding habits (maybe not good habits) that I have been doing for years.

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Bindingsource.fill In The Form.load Event?

Oct 14, 2009

In my form.load event, there is a bindingsource.fill event.After the .fill, there are two or three other lines of code that query the newly filled tablemanager.  The code gets the number of total records and displays that number on the form.Here is the problem ....When the .fill statement is executed, control reverts to the form and any statement AFTER the .fill event is not executed.I have tried to stick the remaining lines of code into some other form event with little success.  These three lines of code only need to run once.Does anyone have a suggestion as to where to stick these lines?

Private Sub SCDBEditWindow_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load 'TODO: This line of code loads data into the 'SCDBDataDataSet.StampCollection' table. You can move, or remove it, as needed.


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Cancel A Form Loading In Its Load Event?

Oct 18, 2010

what's the best way to stop a form from displaying in its Load event.I initialise a form using the following code:

Dim MyForm as new MyCustomForm

In the Load event of MyCustomForm, I ask the user to select a folder and use that to populate a listbox on the form.folder.If the user presses Cancel instead of selecting a folder, I don't want to display the form. Right now, I just call Me.Close in the Load event, but that still causes the form to briefly appear and disappear in the background. Also do I need to call Me.Dispose?

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During Form Load Event I Want To Display The Parentgroup Name?

Nov 7, 2011

open & read my attachment:

Imports System.Data.OleDb
Public Class form1
Dim myconnection As OleDbConnection[code]...

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Form On Load Event Not Throwing Errors?

Oct 7, 2011

I just noticed this, but I had a for loop where I incremented beyond the number of elements in an array. Normally this would thrown an exception.

This was in a form load event, and all that happened was the rest of the code in the event never executed. If I wasn't looking for what was supposed to happen next I never would have known there was a problem!

There was no try catch block there... but I would think it would still stop program execution with an error.

Can anyone explain this? Do I have some stupid skip error checked somewhere (if this exists, I'm going to be really annoyed)? In a button click event I put the exact same code and it threw the error... it seems to just be a problem with a form load event.

My IDE is VS2010 professional (vb)

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How To Run Event Handler Code On Form Load

Feb 23, 2009

I have a form that is built and loaded dynamically when File/open is selected.however I now want to use the same code to open a default file and populate the form using the Form load event to call:

Private Sub OpenToolStripMenuItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles OpenToolStripMenuItem.Click how would I do this? Just incase this doesn't make sense, I want the same code to run during form load as if the user selected file/open but do not know the syntax of how to call OpenToolStripMenuItem_Click() from form load.

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