I need to check the state of a CheckBox in a DGV which I am attempting to do using the CellValueChanged Event. The problem I have is when the DGV is being loaded, the CellValueChanged Event is being run even though there is no data being loaded.
What can I do to stop this event being run, until the CheckBox value is changed.
The only code I have at present is to check the event is working:
[Code]...
I'm loading a dgv with dates from a MySql table. Adding also works fine. No issues there, but when I try to change the date via the datagridview the following exception is thrown:
Quote:
System.FormatException: Invalid cast from 'System.String' to 'MySql.Data.Types.MySqlDateTime'. ---> System.InvalidCastException: Invalid cast from
[code].....
In VB6 we had a code inside textBox_MouseUp to call textBox_KeyUp(-1, 0) and the signature of KeyUp was
Private Sub textBox_KeyUp(ByRef KeyCode As Short, ByRef Shift As Short) Handles textBox.KeyUp
Now when I migrate to .NET I changed the KeyUp event to Private Sub textBox_KeyUp(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles textBox.KeyUp
How can I do this call textBox_KeyUp(-1,0) now from textBox_MouseUp event?
I have code to extract each entry in an event log. If the entry is after a set date (the value of my startDate variable) then it gets the information from the log and outputs to an email (I can do all this, the bit I am stuck on is as follows) I am currently using the following code extract:
[Code]...
I have created a simple framework for a Windows service in VB.NET Express 2008. It enables a timer which then writes to the event log every 6 seconds until the service is stopped. This works fine. I adapted that framework into something further. It is using Windows sockets. Well, I haven't finished that part yet and I just want it to write to the event log successfully but I can't even get it to do that now. I am trying to write an event in the OnStart event. The service is being started successfully, according to the standard event log, but my custom events are not getting there. I don't understand why as I am using the same code for that as I was before.
[Code]....
Say you've got a form, Form1, and you're in the Paint event. Is there a way to test to see if, say, the Resize event is occurring from within the Paint event?
View 9 Repliesis 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 .
View 5 RepliesI'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 ...
Code:
Imports System
Imports System.Windows.Forms
Public Class form1
[CODE]...
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.
View 2 RepliesI'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?
this event works ok, but the problem is that I don't know what field was clicked. Should I use objectinfo or something else? VB.net won't recognize for example e.objectinfo.
View 1 Replieswindows service app I am developing to audit events in the Windows Security Event Log. I am using the EventLog class to read entries from the "Security" event log. I have set the log to raise events when an entry is written so I can parse the data. Here is where my problem comes in. If I run the service on Windows 2003 I can get all the data I need from each entry, but when installed on Server 2008 the EventLogEntry ".message" property comes back with useless data like this, "The description for Event ID '4738' in Source 'Microsoft-Windows-Security-Auditing' cannot be found." Under Server 2003 the message property has good data. Using the Event Log Viewer in Server 2008 I can see that it is rendering the correct data, but I am having a heak of a time doing the same. The "replacementStrings" property has the corresponding data that I need, but it appears to involve some other steps to get the data localized to the event provider, but I do not know how to do that.
I also checked the registry HKLMSystemCurrentControlSetServicesEventlogSecuritySecurity on both the 2003 servers and 2008 servers. They are identical execpt the 2003 has an entry the 2008 server does not:
String Type: GuidMessageFile
Value: %systemroot%system32NtMarta.dll
System.Diagnostics.EventLog.WriteEntry("Application", "Exception: " + x.Message.ToCharArray)in my catch block.
View 2 RepliesWhen the enter key is pressed, I would like to have <br /> added to the end of a each line in multiline textbox then allow me to type next line. Then repeat for each line.
using:
Private Sub TextBox_Body_TextChanged(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles TextBox_Body.KeyDown
If e.KeyCode = Keys.Enter Then
Works ok for single line. Does however insert a blank line above current text and cursor is at start of second line containing text.
I have a dataset and am committing changes to the database using tableadaptermanager.updateall. My datatable has a column called DateAddedToDB. When saving to the db, some records will have this column filled in, some won't. I want to use linq to update this column on each record that is null to a value of now() but am not sure what event to use. Is there an event like BeforeCommit or something like that? Or is my way of doing this completely inefficient and there's a much better way of doing this?
View 1 RepliesBelow is code I have written to capture when the tab key is pressed inside of a two-column data grid view. The only problem I'm having is that I have to press the tab key twice for this event to fire. Would anybody know why this is.
Private Sub dgvCustomerIncludes_PreviewKeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.PreviewKeyDownEventArgs) Handles dgvCustomerIncludes.PreviewKeyDown
If e.KeyValue = 9 Then For X As Integer = 0 To (dgvCustomerIncludes.Rows.Count - 1)
If Not Trim(dgvCustomerIncludes.Rows(X).Cells(0).Value) = "" And Trim(dgvCustomerIncludes.Rows(X).Cells(1).Value) = "" Then
[Code]...
I have this notepad that is all ready to go now except for one thing..when the user uses the X to close the form she does get a confirm exit without saving changes dialog box, the problem is that she did in fact save her changes. So for some UnGodly reason ...,, my event is not picking up the fact that changes have been made.lution to this?? I have been up and down the net LOL..looking for ONE that works here is the code that I have going on for that event:
Private bIsChanged As Boolean = True
#Region "events"
Private Sub frmMyNotes_FormClosing(ByVal sender As Object, ByVal e As
[code].....
Can someone help me with the code for an Event Handler for colorAnimation in VB.net. All I get so far is code in c#, which I do not follow very well. Please also show how to call or raise it from a control e.g. a button.
View 8 RepliesI am trying to include some custom events/methods when I Check a ListViewItem. I have my Class and Inherited the ListViewItem, but can not figure out how I can achieve this. I have looked at adding custom event handlers, but don't think that this is an option. [Code]. Essentially what I want is an eventhandler that fires whenever the Checkstate of the listviewitem changes.
View 3 RepliesI have two forms, A and B. A shows B modally. B can exit normally, or can exit because of an exception. Therefore, I have this code in a method in A:
Dim nf as New B
Try
nf.ShowDialog
Catch ex as Exception
'Whatever
End Try
Now, B has some event handlers that handle an event that is raised when a certain value changes. I just found out that if B exits because of an exception, rather than a normal exit, the event handlers are still hooked up. To figure this out, I added a private string variable, and in the constructor of B I added a line to put a GUID.NewGuid.ToString into the variable. When I run this, I can pause in the event handlers I mentioned earlier, and look at the private variable to tell which instance of B is actually handling the event.
Under normal operations, there is only one instance of B. However, if B exits due to an exception, I find that the instance of B which died due to the exception, handles the event before the new instance of B is even created. At a slightly later date, the user presses a button that will cause the event, and, due to something hard to explain, the event gets raised six times, three each from the old, undead, instance of B, and three times from the new, visible, instance of B.
I think that the entire problem I am having is that the event handler is triggering things that cause the two instances to pinball events back and forth between the two of them in a complex recursion. My problem is how to get rid of that undead instance of B so that it stops handling the events that are raised. I tried putting nf.Dispose in the Catch handler of the above snippet, but that did nothing.
I'm using custom events activation/desactivation in one of my class. Let's say :
AddHandler trv_treeview.BeforeExpand, AddressOf sub_LoadNextLevel
and
RemoveHandler trv_treeview.BeforeExpand, AddressOf sub_LoadNextLevel
In another part of the code, I now need to know "Is there an event attached or not". In my search I found that Vb hold an hidden private variable <Eventname>Event. I've tried trv_treeview.BeforeExpandEvent but with no success. How is it possible, in Vb, to check how many Events are already attached to a method?
We have made on run time a printDocument object.
Dim pd As New PrintDocument
pd.Print()
How do we get the PrintPage and the BeginPrint events?
I have a textBox and a button's click event used to add the textBox.text to a listBox. Is there a way to add the textBox.text value to the listBox without having to click on the "Add" button. Such as, simply typing the text and hitting ENTER on the keyboard?
View 3 RepliesHow to Use an event inside an event but universal. I only want to trigger the textbox text changed inside the button click event.
Private Sub EditButton_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles EditButton.Click
'
' Insert textbox.textchanged Event
'
End Sub
I am working on a app that will monitor the registry for changes to [ProviderOrder] in [SYSTEMCurrentControlSetControlNetworkProviderOrder].
I have it 90% done with this
Imports System.Management
Imports Microsoft.Win32
Module Module1
Dim Watcher As ManagementEventWatcher
Dim Hive As RegistryKey = Registry.LocalMachine
[Code] .....
If I change [ProviderOrder.test] the app tells me the value was changed and corrects it. But it does the correction twice (because of UpdateProviderOrder changing the value). I thought that using RemoveHandler and AddHandler would take of that.
I created a custom class which creates a PictureBox.
The Class looks like this:
Public Class Layer
Dim pb As New PictureBox
Public Sub New(ByVal parentPB As Panel, ByVal parentContex As ContextMenuStrip)
[Code]....
How do I add event handlers to this picture box?
How can i add one more parameter in System Events for ex : I want to add a parameter in Button Click Event.
View 5 RepliesI am working on the Combobox.I was bind the data from Access database to Combobox in the DropDown Event.Now whn i click the Dropdown for selecting value , for one click the dropdown list is not showing. Some System is coming within few milliseconds it went out for second click the list is coming.This happens only whn i click the combobox first time in the form.After second time onwards the dropdown list coming properly.
View 2 RepliesI am having a problem catching the event that happens when a user selects a value from a combobox. What I was using was ValueMemberChanged, but because I am populating the combobox in code during runtime using SQL and a dataadapter and dataset, this also executes the ValueMemberChanged event, so that makes it difficult for me to know when the user actually changed the value.
View 3 RepliesI have roughly 20 text boxes on my form,When you press tab, it naturally selects all text in the box (highlighted in blue), so you can press any key, and it replaces it with that,That result is what I want, unfortunately, if you click into the text box, and tab back to it, it no longer selects all the text.I'm wondering how I can detect the tab event properly,I've tried adding a 'KeyDown' event to each text box, and then selecting the text, but the sub never runs, also tried detecting the tab event in my Main Form, thinking that perhaps the parent handles it and will receive that event, but.. No.I've thought of using an event like 'Activated' however, it will also run when the mouse is clicked.
View 4 Replies