So I have a database in Microsoft Access (its path is c:database.mdb). There are two tables. Table1 and Table2. I would like to read each row of Table1 to an array, and write a row to Table2.
I have looked all over google, but I couldn't find anything that worked.
I have code that connects to queries in an access database.
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Is the data not filling in because of the schema information not being retirieved? If so, is there a way around that?
Is it possible to set a variable in my custom class for Private Read/Write access and Public Readonly access without creating Properties with Get and Set? In other words, from within my class I want full access and from my form I only want read access. Right now I declare my variable as either Private or Public to control Public read/write access. I tried googling my question a bit but I'm not sure what the correct terms even ar
View 5 RepliesI'm trying to get my application to read to and write from an Access database. I am running Windows 7 x64.
If I disable UAC, I don't the error. If I have UAC enabled, then the error occurs. Here is a screen shot of the error:
I've looked for code on this, and it seems needlessly confusing to me. I've tried some code I found and it doesn't return the proper value (I can't find the link to it now). So, I'm attempting to avoid that which I do not understand by writing a function that creates then deletes a file:
Friend Function GetFolderAccess(ByVal sDirectory As String) As Boolean
Try
Dim fs As New FileStream(sDirectory & " estfile.test", FileMode.OpenOrCreate, FileAccess.ReadWrite)
Dim s As New StreamWriter(fs)
[code]....
Through testing, this appears to work for both read and write access. I originally had a File.Exists before the File.Delete, but the function would sometimes return True when it should have returned False.
I am creating a file and then trying to read and write to it. I'm coming up with an UnauthorizedAccessException wa unhandled. My question is, How do I get around this properly or otherwise improperly to read and write to my text file?
Imports Scripting
Imports System.IO
Imports System.Security
Imports System.Security.Permissions
Public Class Form1
[Code] .....
I am just trying to get to grips with the setup tool in visual studio and seem to be making progress but im falling over with access permissions.My projects includes an mdf table and when i install my project the folder and db file is always set to read only and the application cannot write to it.How can i change or set the permission when the application is installed?
View 7 RepliesI've been scrambling my brain to figure out how to access my FTP server thing to get a list of text files in a folder and to edit the contents of those files online.
View 1 RepliesI want to access (read/write) the user entered text for a document.The document text is housed inside a CONTENTEDITABLE DIV tag within a html document.The html document is loaded into the webbrowser object (webbrowser.navigate(path and filename)).When the html document (bulletin.htm) loads,An error is popped up such as ACCESS DENIED to toolbar.htc and menu.htc And the toolbar and menubar are missing or corrupted.I have tried to generate the code for the document using the code below.
Function ScriptEditorHeader() As String
Dim sBuf As String = Nothing
sBuf = ""
sBuf = sBuf & "<html "
[code]....
I am looking for sample code that will allow me to read, write and edit records to a local MS Access DB using VB9.For my project, the datagrid and other controls are not an option.I have looked everywhere and cannot find any code examples.I assume it should be straight forward, but with all the changes in VB9 its tough.
View 1 Repliesi've download the 101 Visual Basic and C# Code Samples from downloads/details.aspx?familyid=08E3D5F8-033D-420B-A3B1-3074505C03F3&displaylang=en i was going to learn "VB.NET - Data Access - Read and Write Images from a Database" from that 101. the program is written in 2003 the conversion of the problem to 2005 and 2008 failed.
View 3 RepliesI am using Visual Basic 2008 Express Edition. Some of the programs I am writing make extensive use of External files (saved games, data, item lists, etc.) I could use an easy way to get these files to ride allong during deployment (cd mostly). adding them to the resources works for some static pictures, but custom structures into lists of info to read and write from are beond that features abilities, same with the settings feature. I have found in other help referance to "MageUI.exe" so is downloading a .net SDK my solution or is there a better trick I can use?
View 2 RepliesI have recently decided to give .net another chance, but i have a few questions about it before i get really into it. RE: Files, I use random access files to store data as opposed to databases (namely i don't see the need for a database for storing so little information(records <200 max) knowing that it is an older system and less "cool" i don't care...) Will vs2010 express read, write to random access files? Would it be done kind of like vb6 (which is my current vb version)? I will be needing to print the text of rich text boxes, is vs2010 express capable of doing this?
View 7 RepliesIn my application, I use Vb.Net 2008 with MsAccess..In SQL SERVER, for creating Pivot Tables, I can use the commands: PIVOT and UNPIVOT in SqlServer, for creating them.But, working with Vb and Access, how can I do it?There is some way to create a Pivot Table, by code?
View 5 Repliesi had an old oledb connector from a .net 2003 application i tried to follow the same steps i used for that but it wont allow me to edit the access database.i was trying to avoid using sql strings because my database is rather large and the primary use of this db is for data entrys.
View 3 RepliesDim cn As String = ("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=Database genk.mdb;")
Dim SQLString As String = "SELECT * FROM Products"
Dim DBConn1 As System.Data.OleDb.OleDbConnection = New System.Data.OleDb.OleDbConnection(cn)
Dim DataSet1 As New DataSet()
Dim DataAdapter1 As System.Data.OleDb.OleDbDataAdapter = New System.Data.OleDb.OleDbDataAdapter(SQLString, DBConn1)
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When the user clicks the button the all the data in my Products table is displayed on a datagrid. How can i put the data inside my Products table into an array so i can manipulate my fields to undergo quick sort.
I have several programs that must write to HKLM in XP and Windows 7/64 Pro.The programs work in VB6 but not in VB.Net 2008 on target machines. It does works on our development machine. Same exact windows. User is an Administrator.NOT using Run as.
Both programs are using the same function
Declare Function RegCreateKey Lib "advapi32.dll" Alias "RegCreateKeyA" _
(ByVal lngRootKey As Long, ByVal lpSubKey As String, phkResult As Long)
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How would I read/write settings to an INI file?
View 3 RepliesI have an INI file built like this:
[registration]
key=<key goes here>
passkey=<passkey here>
and using a registration system (found in codebank here), I'd validate it like that. I just need to know how to read and write from it. All the ones on google are too vague, or focus on the wrong part.
I have a 5 tables in my database and i want to access all my tables togather at a time.e.g.I have a code for one table i.e. rs.Open "select * from Group_info", con, adOpenDynamic, adLockBatchOptimistic. instead of Group_info table i want to access 5 tables also as Login_table,User_info table,group_name table etc. How i do that
View 11 RepliesHow can I make txt files and read them in VB2008? The text file does not just consist of one single line. But probably more than a single line.
How do I read the txt file and put each line in one variable.
For example, the txt file:And read it, putting each name in an array variable.
I have written tons of websites with PHP and MySQL, now I want to combine a website with a program on the computer.I have searched google, but I cannot find a good tutorial on how to use MySQL on a server with Visual Basic.NET I need to connect to my MySQL database, read data, and write data.
View 6 RepliesI am trying to read/write a simple text file in net 2008 but can't, as yet, get it to work. This is how I use to do it in VB6
Code:
MyStr = App.Path & "DataData.txt"
Open MtyStr For Input As #1
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I have gotten this error: Attempted to read or write protected memory. This is often an indication that other memory has been corrupted. Description: An unhandled exception occurred during the execution of the current web request. review the stack trace for more information about the error and where it originated in the code. Exception Details: System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory has been corrupted. The error is at code in red.
[Code].....
I am trying to use a .dll in .Net that was written in C++ and was previously used in a VB6 application. I get the error mentioned above. I see lots of posts referring to how VB6's long data type is different in .Net but these fuctions use only integers and strings. Can anyone tell me what is wrong with this?
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
Module1.lp_checkout("Redistricting", "9.0", 1)
End Sub
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I am working on an application that starts a few threads every second. The threads don't do much, and everything seemed fine. I monitor the number of threads running, and I have never seen it higher than 4.
Last night I started the app and this morning I had this.
System.AccessViolationException: Attempted to read or write protected memory. This is often an indication that other memory is corrupt.
The threads can make changes to two List(of Strings) and I had SyncLock's surrounding the code that did that. It has been running for several hours again and all seems well.
My question is that I found a place in the UI thread that was copying the list without the lock. Could that have caused the error?
how to debug something that isn't going to fail conveniently?
I have a .dll file ( MySql.Data.dll ) that I'd like to be able to open, view and possibly edit the database but I can't find any examples or documentation on doing so.
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How can I write and read a string array to a text file?
View 2 Repliesi have the code bellow to write a structure to a text file, but nothing is happening,how can i get a error message if the file doen't exist?
Imports System.IO
Imports System.Runtime.Serialization.Formatters.Binary
Public Class Form1
[code]....
i am trying to open and navigate to second web browser when i recieve this error; here are the details;
System.AccessViolationException was unhandled
Message="Attempted to read or write protected memory. This is often an indication that other memory is corrupt."
Source="System.Windows.Forms"
StackTrace:
[Code]...