Can't Disconnect From CR-connected Database
May 30, 2006
I'm viewing reports on a VB.net form using CrystalReportViewer. Once a report is opened, the Access database that is used within the report is locked (i.e., the Access MDB file can't be deleted). Even after the report is closed, the database stays locked until the VB.net app "ends". This is a problem because I want to be able to delete the MDB file at some point while running the app and can't. The VB.net app starts by opening a form named "Startup". No database connection occurs here. A button is pressed using this [code]I must not be properly closing the CrystalReportViewer or the Report form.How do I close the Crystal report and unlock/release the Access database?
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Oct 16, 2009
I'm writing a little application that needs to detect when a USB Mouse is Connected and Disconnected. I am running into a dead end when trying to determine the best way detect this. I have tried WMI and WmdProc but I think I am hitting a mental block trying to figure out the best option.best way to listen for the connection and disconnection of a USB mouse?
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Aug 5, 2009
Is there anyway that i can get a program to disconnect the user from there internet that they are currently connected to?
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May 24, 2012
I Have created an application with MySQL as database server.everything goes fine.When i tested the application on multiple system at a time.When i monitored the database server (MySQL) I saw huge number of connection to the database. and all are in sleep mode.I used below code for connecting and closing connection after every query.
'Connection variable declaration
Public conn As New MySqlConnection
'Connection Opening command[code]....
But i see huge number of connections in sleep mode at database server.
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May 2, 2010
I have connected a database query that I made using MS Access 2007 to my form in VB 2008. I know how to pull the fields onto the form and get the information to display on the form by clicking the binding navigator at the top of the form. My question is that is there a way that I could input the ID number in a textbox and click a button to display the rest of the field in some more textboxes
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Apr 4, 2011
On my program I am trying to make a ToolStripStatusLabel's text change to "connected" if connected to a network and if not connected to a network change the text to " Not Connected" then I don't know how to display a image if connected to a network or not connected. So if the computer is connected to a network I have a image that I would like to be displayed next to the ToolStripStatusLabel. And if not connected to a network, can the program display a different image? I tried this:
My.Computer.Network.IsAvailable=True(ToolStripStatusLabel2.Text "Connected")
My.Computer.Network.IsAvailable=False(ToolStripStatusLabel2.Text "Not Connected")
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Nov 10, 2009
I am trying to find out if the connection of my sockets (TCPClient) is connected or not connected. I am using the following code:
[Code]...
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Jan 11, 2010
I am trying to add a data source from a connected database but it doesnt seem to be working well.Initailly the table name was mispelled and there where fields missing. The table was modified to include the new fields and it was also renamed.The changes are reflected in the dbml file within the project, and the solution has been built with a sucessfull result.The problem is, when I try to add a new data object into my solution, the changes that were made to the database arnt reflected in this new data object.
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Apr 15, 2010
i am using Visual Studio 2008 and VB.NET 2008 and SQL Server 2005 as the database. I just finished designing & writing codes for a customer information and , however after it has been connected to the database only one of the datetimepicker can be click, and the rest of the function including in the form are not working!it seem that the form stuck and NOT responding. i cant even close the form (X button), so i have to stop the process using compiler (visual studio 2008), however if i press the 'Delete' button before the 'Add' button, it will successfully delete the data.. but if i disconnected the form from the database, (disabled the form_load codes [put 'quote']) the both of datetimepicker will work and able to view the date interval (after pressing the 'Calculate Period' button) in addition how to make it appear automatically in screen without using the button? below are the code, I try to make some other form.. but it is still the same
Code:
Imports System.Data.SqlClient
Imports System
Imports System.Data[code].....
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Jul 21, 2009
i am wondering if it is possible to get the source code for the following:
1. use vb.net code to set on/off primary key when connected to Access database
2. update a particular data.
for e.g: hostname: AES-19 *use source code to check data in Microsoft Access database
if hostname is new, insert into Access. if hostname already exist, update into Access
*so that i will not have duplicate data in Access.
[Code]...
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Jun 21, 2010
I have connected a form to my database, which displays info when the form loads, butttt it displays them from load, which is not what I need, can someone tell me how to clear the form upon load so that none of the textbox fierlds have data within them? Untill I request them to.
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Nov 7, 2011
I am designing a Point Of Sale system to be used by sales representatives. The sales rep should be able to place an order of a specific product on behalf of the customer. I have defined my relationships between the tables, Product, Order and Customer. When i try to save my orders i get an error that says "you cannot add or change a record becuase a rerlated record is required in table Product"
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May 3, 2010
cn = New OleDbConnection("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=D:ESHAN PROJECTUSMANasp.net_projectsHEALTHFOUNDATION PROJECTdatabasehvaccine.mdb")
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Feb 4, 2012
I have a thesis project. it is composed of a webpage created on php and a system using vb.net 2008. As of now , they are both connected to the same database. I am wondering if it is possible that if i packaged the system and live the website, will still be connected with one database?
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Mar 26, 2011
I have a system that can add, edit, delete and search data that is in ms access. That ms access is connected to my vb 2008. I'm upgrading my system so that it can print the access file.
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Jul 2, 2009
I have a connection to an access database, I have used the data sources tool provided because in this particular instance I don't want to do much with it other than display the records (which I can do) and edit them (which I'm haveing some trouble with).I have created a system whereby the database is connected to using the preset tools available like; BindingSource, TableAdapter, BindingNavigator etc.
I also have a button for edit. This doesn't work and I was wondering if anyone could help me with this? I can't really provide any code for this, because I didn't code the connection by hand and the code I have been attempting to use for editting the records in the database doesn't even sort of work.
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Aug 16, 2009
how do i delete selected row from a datagrid connected to sql server database...?? Delete selected row and update database.
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Feb 17, 2011
I am trying to develop an application using VS 2008 connected to MySQL database. Previously in vb6 i was using adodb and now when i googled and got a few sample projects done using VS2008 in which most of the module codes were OLEDB.....To which method should i stick to...?
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Apr 9, 2010
when i will enter form no. in the text box this should check the on the lost focus event either this form no. is already exsist or not.if exist show msgbox?
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Jun 14, 2012
When a vb project is connected to ms access(DB) whenever u make any changes in d db using addNew or insert or delete follwed by update command the changes are reflected in copy of original db in the debug folder of our project.in which updated values chnges with each run .. no changes are reflected in d original db.is dere any command to make dese changes permanent.
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Apr 5, 2010
I have a windows app that has a bindingNavigator connected to BindingSource that connects to an Access database. I am manually adding a record to the underlying database using an OLEDBConnection/command (cloning the current record). The insert into the database works fine, what I am not sure on how to do is force the bindingNavigatgor to refresh and read the new record and refelect it in the record count/next/previous buttons.Jack
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Sep 22, 2011
I've searched the forums but never seems to find an answer for this one.. I recently connected to MySQL database server "Automatically" in Visual Studio 2010. I want to know if there's a way to determine the connection state for "Automatically created" connections in Visual Studio 2010. I know how to do it for"programmatically created" connections but just want to know how on the auto-generated ones.
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Jun 22, 2010
I'm trying to populate a tooltip with a list of users connected to a database when hovering over an row in a ListView.
I'm using sysprocesses to show a list of databases and the connections, how do I tie this together?
[CODE]...........................
I've attached a mock-up image of what I'm trying to achieve, is this possible?
Private Sub LVDatabases_MouseHover(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LVDatabases.ItemMouseHover
[CODE]...............................
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Sep 22, 2009
I got a DATASource connected, changed the table to details and draged it on to my form, but then it shows me the bindingnavigator at to of my form.
q1. how do i make it so every time this form opens it is like add new?
q2. how do make my own save button (don't want the binding navigator at top)
q3. in my form all my collums aper as textboxes how can i change it so there is a drop down menue that has forexaple 3 pre defined items that the user has to select on of.
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Dec 9, 2009
How do I create a Login Verification routine (Login Form) in vb.net . i have an windows application with login form contain user name , password , ok button and cancel button .
as this one:
Imports System.Data.OleDb
Public Class LoginForm1
' OK button
[Code].....
but i want to run my application from desktop and will get confirmation if the user name and password correct by checking them in MS Access Database in the server.
so the the application in the desktop and the tabel of user name and password in the server.
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Nov 30, 2010
Can someone please help me create a very very simplistic sample page as the chat page included is too coomplete. something as simple as detecting a change in the database and displaying the word "change" on screen in realtime for any client connected.and I tried creating a global.asax file into which I added in the line mentioned in the link above, but it does not seem to like the word "Setup" in the line [code]
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Nov 29, 2011
i have created a projevt in vb.net.......and i'm going to deploy it......in my project i use vs2008 and sql server 2005....i already added database.mdf and .dll files in application option.....but when i run this setup on other pc ....project successfully runs......but when i want to use database the following error occured.."database could not be connected"......
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Jan 17, 2009
It is possible to disconnect an IP in a port? I have a MMORPG server, and I need kick bad players using IP of this player.
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Apr 2, 2010
I connect an OPC server, I can get Datas, But when i try to disconnect from server Opc server's clients size does not decrease until program closed.[code]It gives no error. It removes all items from GRP1 but cannot disconnect.
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Aug 27, 2010
I am currently working on a messenger client that connects to a server then back to the clients for full chat room support.I have it operational however when you close the client before connecting to server it closes normal, if you close the client after you have connected to the server then the client dissapears but it is still running in processes. To make it worse if you close the process it then kills the server.What I need is a disconect button code so it will stop crashing it.Here is my code Client:
Imports System.Net.Sockets
Imports System.Text
Public Class Form1[code]......
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