in the begining i cold the database (accdb 2007) (AGC)and the table(telp)
in form declaration
Dim cn As New OleDb.OleDbConnection Dim cmd As New OleDb.OleDbCommand Dim ad As New OleDb.OleDbDataAdapter Dim cmdb As New OleDbCommandBuilder Dim dbs As New DataSet
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code to access SQL Server database in connected and disconnected mode through ADO .Net.
View 4 RepliesWhat is the real mode , protected mode , supervisor mode and the hypervisor mode ?
View 1 RepliesIs possible to run code while computer is in log off mode? How can i do this?
View 1 RepliesI am using Visual Basic 2010 Express. I have a form with some text boxes on it. There was some code on that form which was giving errors. So I deleted the whole code. Now the problem is, I cannot see the form Design mode button to view it in design mode. But when I hit F5, I can see all the text boxes (in Run mode). I want to add some more controls on form. How to resolve this problem?
View 2 RepliesWhen I am in break mode, I cannot update code.I receive message "Cannot currently modify this text in the editor. It is read only." Can anyone explain why I get this message?
View 1 Repliesi wrote a piece of code to write some data to a card reader, and read back from that device, filling a form with the data (after reformat).When I step through the code while debugging (using F5, F8 for stepping forward) the form is filled correctly.However, when I run the code (Ctrl-F5), the program seems to hang for about 5 sec and then throws an exception: 'Length should be >0' When looking further during debug - it seems that the program calls 2x the Sub Frm_Read_Display(). I
Imports System.Windows.Forms
Imports System
Imports System.IO.Ports
Imports System.Threading
[code]....
In the Visual Basic 2010 development environment... i.e. cannot edit code when running in 64 bit mode.
View 2 RepliesHow can i test that the code executes in debug mode.
Here is what i would like to do in pseudocode
if not debugMode then
Do something()
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Is it possible to switch Visual Basic 2010 Express to MDI mode so I can view the code behind alongside the form design?
View 2 RepliesI'm wondering if there is any code that I could use in VB.net so it can determine the computer's startup mode (such as safe mode or safe mode with networking).
View 1 Repliesi am using visual studio 2005 on win 7 with office 2007. i have developed win application. i am using microsoft activex spreadsheet component in my program. so it automatically creates reference to AxInterop.OWC11.dll When i run program in debug mode (open program and click RUN in toolbar it works) but if i run directly .exe (go to bin elease doubleclick .exe) it give error at loading point of that component. It says "Attempted to read or write protected memory. This is often an indication that other memory has been corrupted." An unhandled exception occurrs.
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I just read a book : Pro ADO.NET 2.0.It discuss about the disconnected and connected feature of the ADO.NET.In disconnected, the "data container" is DataSet.But it doesn't say anything about the data container if i use the connected feature. In ADO, we have recordset, what about ADO.NET.
View 3 RepliesIs there any way to run code when COM object is about to be disconnected from RCW without implementing IDisposale interface and explicit call MyObject.Dispose in client code?
The code below is not working. When program enters Finalize sub, ExcelApplication is already disconnected from RCW, and I get error. I understand why it happens, but I want to get a solution.
I want to make it working the following way: when last managed reference is released, code from Finalize sub is executed before COM object is disconnected.
My question is - is it possible at all and if it is then how can I handle this event inside the class, without need to call Finalize explicitly from outside?
Very simple class:
Public Class ExcelRunner
Dim ExcelApplication As Excel.Application
Public Sub New()
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what is a disconnected architecture in dot net?Why are the dataSets a disconnected architectures in dot net?
View 15 RepliesI am using the following code to receive data in a seprate thread
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Now if my client shuts down elegantly then my application knows that the client has disconnected but if my client is removed from the network or any other issue occurs them my application does not appear o know that the client disconnected why is this ??
I work for a shop that maintains a fairly new app. The app still has its fair share of bugs, with numerous tickets coming in daily. The error information we're given with those tickets is not as useful as it might be because the application was compiled in Release mode, which I read is smaller and faster (makes sense).
Are there any ramifications to deploying a .NET application to production that was compiled in Debug mode? I would expect it would be a bit slower, but I've read the difference is nominal. This would assure us that when we get errors on tickets we have line number associated with those errors and this, of course, makes debugging much easier. major red flags that would prevent you from doing this? I'm tasked with researching the possibility.
i am using the client/server classes for file transfer by moeur.what i want to know is that once my client is connected to the server and after that the client machine goes off the network. now when my server trys to send a file or some message to the client i am not able to trap the error that the client is disconnected.how to do this. there might be a case where the client machine suddenly shuts down. in such cases how will my server know that the client has disconnected.
View 2 RepliesI shipped a VB .NET app to my customer. They installed the app in program files folder. The app starts and everything works ok. Now my customer reports that some intranet TCP/IP connections are interrupted after starting the app. Sometimes they are not available after starting my app, sometimes the intranet connections are still available after my app has been started. After my app has been started, there are connection error messages to their intranet services. After re-starting the machine, they still can't connect to the intranet services. A fix is to login with another user name or re-load the profile from the server after they have been logged in on another machine.
Do you have any ideas where to start further investigations? Is it possible that my .NET app interrupts or blocks intranet connections? Could you recommend any trace tool that gives me a hint when and why the intranet connections are blocked? Why could it work for them after they login on another machine?I am wondering if my .NET app could disable the intranet connections. Do you have any recommendation for testing that?
How do i trap a connection string that is disconnected?
View 5 RepliesThis is applicable to C# and VB.Net. I am writing a console application, but one aspect of it I want to make representable in a GUI (that being downloads running, with progress bars). is it possible to write a console mode application that can also have a form in it that can be called from code inside the console component?
View 3 RepliesI'm using an OLEDB connection to a Sybase database, with ADODB.dll file version 7.10.6070.0 (which comes from the Sybase 12.5 package). I need to be able to open a connection, use a command object to fill a recordset from a stored procedure, then close the connection and pass back a disconnected recordset. My attempts so far fail as every time I close the connection, my recordset also closes (which means it is not disconnected).
Is there a property I must set somewhere to indicate that the recordset should be disconnected? I cannot set Recordset.ActiveConnection = False because I get an exception ("Cannot change the ActiveConnection property of a Recordset object which has a Command object as its source."). I do set the Command.ActiveConnection = False, but that doesn't stop the recordset from closing as soon as I close the connection object.[code]...
I found an example of a simple irc client, but I'm really confused about how it sends data back to the irc server. In the example, this is the code used to respond to the server's PING request. it lies in the onDataArrival event of a sockets client:[Code]
However with this simplified code, as soon as it tries to respond to the PING request it is disconnected from the irc server with the reason "Excess Flood". So I was hoping someone could explain to me the difference between the pretty complicated method and my simplified one which doesn't work.
I have a stand alone VB.Net 2005 application that uses a serial port that generally stays open while the application runs on a Windows XP system. In trying to bullet-proof the UI, I ran into a problem when the USB to Serial Converter normally used to provide the serial port is disconnected while the serial port is open. In trying to handle the resulting error when accessing the port, I find I cannot close the port.
When trying to do so, the error message says something like "unable to close the port. You may not have sufficient permissions." Reconnecting the USB/Serial Converter does not reactivate the port.
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When in "Add" mode, I have all controls on the form enabled with the exception of a listview that is disabled until the record is saved. The listview needs the primary key from the saved record in order for items to be added to the listview.
When in "Edit" mode, the form is populated when a record is selected on a search form. Specific controls are disabled. When a value in a control is changed, I have a RecordModified property that is set to True and then the Save button is enabled. I also have combo boxes that need to be populated but the selected value needs to correspond to the value pulled from the database
Whenever I make any changes in my project, they don't work and aren't visible in debug mode. They are all visible in my designer mode. It's the same with newly added code, it just doesn't work (even a simple command like showing a test messagebox doesn't work).
How could this be? It all worked fine until recently. I don't want to start over with my project, because it's a pretty big one.
i want to check if the computer is in sleep mode or not...Suppose my project is in normal state..I change the state to sleep mode,I want that now when the computer wakes from sleep mode,I want that my project is in minimized state..How to check dat?
View 3 RepliesI want to check if the computer is in sleep mode or not...Suppose my project is in normal state..I change the state to sleep mode,I want that now when the computer wakes from sleep mode,I want that my project is in minimized state.[code]....
View 14 RepliesI have no idea why when I compile and run my application in x64 mode or anycpu my application crashes some time. some times it returns : Unhandled Exception
Attempted to read or write protected memory. This is often an indication that other memory is corrupt. and some times just says x has stopped working w/o details, any one knows anything about it ?
I want to create an application that can run in both GUI and CLI mode. Basically what I want is when a user double clicks an EXE they get the GUI but when they run it through a command prompt they can supply CLI arguments and run entirely in the command prompt. I know that VBScript has the difference between Wscript and Cscript, but I don't know how to do that in VB.
View 8 Replies