We all probably know that the .NET Framework provides System.IO.File.Exists(). What I need is the best iron-clad method of detecting .File.Closed(). Which means no other processes are using the file. Here's my "tried and mostly true":
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I need a way to detect when a child form has been closed. I've created an MdiWindowList thing (but in the form of a toolbar with buttons, similarly to the Windows taskbar), and everything works great, but the method I have for refreshing the taskbar's windows has to be called when a child form closes. I've trying calling the method from the child's Form_Closing event, but there's a slight lag so whenever there's more than 1 window open the first one gets skipped (then the others close properly, since the taskbar is being refreshed first before the form actually closes).
View 10 RepliesI have an application that uses a NotifyIcon in the tray to hide/restore the application, as well as pop up notices to the user of application events. My application has a notification queue, and I use the NotificationIcon.BalloonTipClosed event to determine when to reset the balloon and show the next notification (if there's one in the queue).
This method seems to work great in both usual causes (user lets the balloon close itself when it times out, and user clicks "X" in balloon to force it to close), but there's a third case where BalloonTipClosed doesn't get called:Notification balloon pops up While it's visible, user right-clicks on notification icon to bring up context menu, causing the balloon to disappear
The BalloonTipClosed event doesn't get triggered in this instance - I figure it's a bug in the framework (I'm using 2.0), but does anybody have an idea around this? If I don't get this event, my application always thinks there's a balloon visible (I have a boolean that prevents it from displaying multiple balloons at once), and it will never show another icon again, as long as it's running.
I want to write a simple program, which should inform me before any files getting open (like as User account control in Windows Vista or Windows 7). I came to know that all antiviruses use this technique to detect viruses before they are affecting the system. My program must ask me as "Are you allow this file to run?" and allow it if I allow otherwise terminate the file.
View 2 RepliesI got a strange form in my project that doesn't close when I close it, so every time the user will use it, it will stay on system processes. The form is not even shown on the taskbar when it is loaded. It is just a regular form - System.Windows.Forms.Form.
View 9 RepliesIn my table date value exist in the date filed. I want to remove the date value based on some condition. How it is possible? I used delete command but the entire row was deleted. I tried to update the date as null but it showing conversion errors.
View 12 RepliesHow can MS-SQL Database access wise vb.net
1-How can load data to combobox from table filed?
2-How can check how meany data in the database filed.
When i try to make a classes by LINQ to SQL for a database i can see all fields from database ( which contain a int filed and nvarchar(50) and Float but when i try to make crystal report and make a connection from current connection i can only see fields of int and varchar(50) but i can not see float fields
View 4 Repliesfor example i have this code :
Sub Month()
Dim Conn As New Data.OracleClient.OracleConnection
Conn.Open()
Try
Dim Cmd As New Data.OracleClient.OracleCommand
With Cmd
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What will happen to the datareader when the Connection is closed ( Conn.close)
Will the Cursor that is used by the datareader be freed ? or will it stay open ?
If the cursor that is used by the datareader is still open , when will it be automatically closed ? or should i just closed it manually ?
Will it cause the dreaded "ORA-01000: maximum open cursors exceeded" ?
Detect system shut down?
View 2 RepliesI would like to know how to detect if a persons operating system is Windows 7, I'm a bit new and have no idea how to do this.
View 3 RepliesI have an application that detects a Power mode change using.
SystemEvents.PowerModeChanged
if there is a way to detect if the system is going to sleep or hibernate?
I am writing an application on Windows-7 using Visual Basics 2010. I am accessing System Date with
Dim today As Integer
today = Format(Now, "dd")
Well, that works fine. But I need some indication/notification when system date changes, so that I can retrieve the new date.
i am developing a system will be able to detect motion. up to now i am able to stream the video that is connected to my PC to VB.NET. Now i want to switch between the webcam if there is more than one webcam connected to the system. For example, the user of the system will be able to chose any webcam that is connected to the system. I am able to detect all the webcam and display those devices into a ListView. But i don't know how to change the steaming video when the user select the device. Now the video screen show the image form the default webcam.
View 1 RepliesI am writing a application where i need to know which games are installed on a system.I have 3 ways by which i think i can detect the games
1: Scan specific parts of registry and look for key names that match with a List of Publishers. The list is manually maintained.
2: Scan the hard disk for and do same as in step 1
3: run the program in background and check for programs in memory that use a large portion of memory(which games always do) and if they use Direct X ( Which all games do except for some) then its a game.
Now i have been thinking about it and first and second method seems to be in need of a updated database ie list of publishers to make out if a particular program is game.
how to detect/identify the system login, System screen lock, unlocking the system screen & finally the system Logoff event.Basically I want to capture the system time when these events occur by creating a windows service which runs in the background.
View 6 RepliesI get this error on the server. I cannot replicate this on my development machine.I get it when i call ExecuteReader, ExecuteScalar or when i try to fill a dataset.I use an oracle database.This, i think, increases when the load on the server increases. Im not sure.i need help fixing this. Please let me know if you need anymore details.The code for ExecuteScalar would be as follows
Public Function ExecuteScalar1(ByVal sExecuteString As String, ByVal sConnectString As String) As String
Dim OrclCmd As New OracleCommand
[code].....
Is here a way to detect Yahoo! Messenger popUp window appearing in system tray when an user from my list logs On or Off?[code]...
View 1 RepliesI need code to fit for an 'if then' statement based on an operating system. So let's say I am running windows XP, the program detects it, and with a simple if then' statement it opens form2, if i was running vista, it would open form1. So basically i need something like: If (WindowXP current OS) then form2.open, If (windowsvista currrent OS) then form1.openOf course, the above statement won't work because I need code to support the detection of the O.S.Note: I just need code for just these two O.S'es, also I don't care if its Windows XP SP1 2, or 3, just as long as it's an XP.
View 4 RepliesWe have a situation wherein we need maximum uptime for database connectivity which is on our LAN. However, we would like to connect to the server also in the event that the LAN is down. We have option of doing this [switch to dial-up from LAN] automatically using code or manually an operator can do so. The problem is to determine if the current connection is whether on a LAN or Dial-up?
View 1 RepliesI wanna detect the version of installed Visual Basic Power Packs in target system.How can I do it with Registry values (Windows from Win XP)?Or, How can I check the version of Visual Basic Power Packs assembly , e.g : how I can check the version of Microsoft.VisualBasic.PowerPacks assembly ?
View 1 RepliesMy app is running in the tray and I want it to give a reminder to the user its there when they resume from a hibernation, sleep, or from being locked. I know how to handle the popup, but I cant find out anywhere how to detect that 'wake' status from those power saving modes.
View 2 RepliesI want to detect the operating System of a local or remote pc based on the IP or computer name I typed in a text box, these will all be on the same domainThis is what I use for the local OS version
View 4 RepliesI have a laptop with windows 7 and I am trying to make a program for it. I want it to do is after a certain time of day when I close the lid of my laptop it will make it go to sleep. But at every other time of the day I want it to stay awake when I close the lid.
I have been looking all over the internet and i don't understand what people are saying.
If anyone can tell me a way of knowing when my laptops lid is closed in vb.net that would be fantastic.
I have the following snippet in the load event of a MDI child:
Try
foApplRole =
New ApplRole
ugRegionUser.DisplayLayout.Bands(0).Columns(
"User_ID_C").ValueList = uddUser
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I am trying to create a locked down browser for the employees at my work to use at a kiosk. I need to prevent the user from getting out of the app. I have figured out how to prevent them from closing it by pressing alt-f4 or ctrl-f4 but I would like to also prevent alt-esc, ctrl-esc, alt-tab, and the windows key. I am new to windows application development but have experience in web vb.net. I am using VB.NET 2010 express.
View 1 Repliesi make progran used vb.net 2005K anf then instal this program in tow computer and work withot any problem
then i install this program in third computer but when i try to open by click the massege appear ( program name has encountered probleam and need to close )
I can't understand why I'm getting this error. I'm trying to parse a tab seperated file. After 10 lines being read it throws the above error which is an ObjectDisposedException.
Public Function readNextLine(ByRef buffer As Single()) As Boolean
Dim i As Integer
Dim tempString As String()
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I can't understand it, it's called and operates fine for the first 10 iterations and on the 11th throws and error. There is nothing special about that line in the log file.
I'm testing out the use of shells and I want to know if theres a way to check if the shell is exited.
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I am using the visual studio 2008 but use the guide for 2oo5 .I wonder why the program show error after click the load button (btnload). I am following the http: [URL] and having problem with the 'Filling the DataSet'. Is it because of different version?
The code I use:
Public Class Form1
Private Sub Ordered_booksBindingNavigatorSaveItem_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Ordered_booksBindingNavigatorSaveItem.Click
Me.Validate()
Me.Ordered_booksBindingSource.EndEdit()
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