i'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'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:
what I am trying to do is i have a table with four records and I want to write it to a txt file. I am running sql server 2000.I am able to connect to my database and I am able to right data to a txt file my only problem is it always returns the 1st row of data.
Dim FILE_NAME As String = "C: emp est2.txt"
Dim conn As New SqlClient.SqlConnection
Dim da As New SqlClient.SqlDataAdapter
[code]....
I'm trying to write data from an excel spreadsheet to an Access database. When i run my program a message appears saying that the correct number of records have been saved, however when i check my access database no records have been written to the database table.
The following is a copy of my code (sorry i've just edited it to get rid of the white space that was added when i included it here for some reason.The code for writing to database:
Public Class Form1
Dim connection As OleDbConnection
Dim Command As OleDbCommand
[code]....
images and text and music in one file with my own extension?
View 16 RepliesWhat type of connector do i need to actually save the Map data like point of the images (x,y coordinate) into the database . and then retrieve it to show on the page in asp.net and how do i go about doing it.
View 3 RepliesIs 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 RepliesWhen I install my application, some forms are unable to connect to the database.
I say some because, when my login form works totally fine. Authentication happens.
But once I go into the main application, and open other windows, I start to get these error mesages:
[URL]
I am trying to figure out how I can add data from my textboxes to the appropriate tables and columns in a Microsoft Access database that I have made
View 7 RepliesSo 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 am using the code shown below to compare two Access databases with two fields each and write the results to a third Access database. I am getting an error at the "Do While DMReader02.Read = True" line: "Invalid attempt to call Read when reader is closed." Why would the reader be closed at this point if I am using different DataReaders in the two loops?
Imports System.Data.OleDb
Partial
Class Form1
[code]....
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 need to read and write to a database (access 07) using visual studio coding in vb.
View 3 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 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 Replies[Code]...
table building contain the buildin information table costomer conrian the customer information table picture conrian the Picture i save these information from anther form but when i binding the data and click next button the picture dont change
I am trying to retrieve jpg files from access database this is the code I used to insert the jpg picture into the database. I am using vb.net 2010 and access 2010
Dim jpgFile As String = "C:UsersPublicPicturesSample PicturesJellyfish.jpg"
Dim o As System.IO.FileStream = New FileStream(jpgFile, FileMode.Open, FileAccess.Read, FileShare.Read)
Dim r As System.IO.StreamReader = New StreamReader(o)
Try
[code]....
add user to access database but it's doesn't work the problem here
SavInto.ExecuteNonQuery()
My first question has to do with the opening lines needed in a VB program in order to connect to Excel 2007 and read/write some data from/to it. I know the process only slightly and reading and writing to the cells is not my real concern for the moment. What I need to become familliar with are the lines like this:
CODE:
This is just one of the examples I have read through and to be honest I only follow this slightly. The trouble was that with each new article I read, people did this differently, not the variables on the left mind you, just that some left out lines, which I can see could be done based on circumstances. Still others said the Imports line was not needed....etc...and other loaded up at least 3 or four more Imports lines insisting all were needed.
I'm looking for some straight-forward advice on what is the minimum needed to access an existing Excel spreadhseet and to just read some of it's cells to variables in the code and then writed some data back to certain cells within the spreadsheet and then save and close it.
Also, please note that I am using VB 2010 Express. Why, because I'm a broke developer who spent most of last year out of work. I have a new contract assignment which is so far going well but will go even better if I can master this technique with VB.NET, not VBA. And all the docs I've read said that even though VB 2010 Express is a watered down version of VS, I should be able to do medium level tasks such as this with it.
I'm trying to write a ClickOnce ap that will connect to a web database and download the data into a collection that will be written into a local database. This will allow the user to update the data while online but use the program while offline. I see it as a hybrid ap using both Windows forms and asp sql calls.
View 7 Replieshow to store & retrieve images from d access database using vb.net 2008
View 2 RepliesI have code that connects to queries in an access database.
[code...]
Is the data not filling in because of the schema information not being retirieved? If so, is there a way around that?
How Can I load data into my datagrideview from xml file
View 8 RepliesMy assignement is to create a simplistic checkbook organizer. The GUI is built, and the form is needing to call to a transactional class i have created. My problem is I dont know the right commands or syntax. I though I had it, but i'm getting an error.
Error: "Arguement not specified for parameter 'PreviousBalance' of 'Public Sub New (PreviousBalance as Double)'.
Here is my code so far for the form:
Private Sub btnAddTransaction_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles btnAddTransaction.Click
'declare user input variables in this GroupBox2
Dim TransactionAmount As Double
[code]....
Firstly I've searched the forums and cant find anything on this how to access an email account, then read unread emails received and then write the email body into a database.
View 1 Replies