I am trying to host my website and the database, but I have same problems and I don't know why .
This is the error message:
Or try this:
Open Notepad, type
icacls "c:\dzsqls" /grant Everyone:(f)
Then save it as SQLPermission.bat file and double click the newly saved file. This will give full control to Everyone to the C:\dzsqls folder. When done, test your connection again. If you have trouble, report back
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I have a simple data entry Windows Form with a datagridview display that links to a local database. When I run the program and try to add data on another computer, I get this message:
Unhandled exception has occurred in your application. If you click Continue, the application will ignore this error and attempt to continue. If you click Quit, the application will close immediately.
An attempt to attach an auto-named database for file C:\Users\roberto.yepez\Documents\Visual Studio\2010\Projects\Financial Aid Calculator\Financial Aid Calculator\StudentInfo1.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share."
The file path is to the path on the computer where I coded the program.
Here is my code:
SqlConnection conn = new SqlConnection(#"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename='C:\Users\roberto.yepez\Documents\Visual Studio 2010\Projects\Financial Aid Calculator\Financial Aid Calculator\StudentInfo1.mdf';Integrated Security=True".ToString());
I am a self-taught coder, please help! :)
I believe you're running into a problem because your local sql server to which your code is trying to attach the StudentInfo1.mdf (whose path is in the connection string) already contains a database called StudentInfo1 - it decided to try and create a database of this name based on the name of the mdf file. I'm guessing that you can pick your own name by specifying Initial Catalog in your connection string but this would mean there are two databases with possibly the same set of tables and a potential for confusion
Per the comment I posted I would instead advocate that you use SQL Server Management Studio to permanently attach your db (you make have already done this) and then adjust your connection string so that it refers to the permanently attached db. This reduces the chances that your next question will be "my code says it's updating my db but I cannot see any changes!?"
Please move this connection string
"Data Source=(LocalDB)\MSSQLLocalDB;AttachDbFilename='C:\Users\roberto.yepez\Documents\Visual Studio 2010\Projects\Financial Aid Calculator\Financial Aid Calculator\StudentInfo1.mdf';Integrated Security=True"
to app.config file. When you deploy to production, change the paths in that app.config, according to the production machine settings.
You can even apply transformations on the app.config to deploy in various machines/scenarios.
Can we access a database file with non-.MDF extension using C#?
We are creating a setup project. We don't want the user to know the database details which is installed in the installation folder. So, I have tried renaming the database data file and log file with a random name without any extension.
When I have tried accessing the file from c# we are getting an error like:
An attempt to attach an auto-named database to file D:\SQLExpress\DB\abc123tmp failed. A database of the same name exists, or specified file cannot be opened, or it is located at UNC share.
Can anyone help me solve the issue?
Start SSMS, connect to (localDb)\MSSQLLOCALDB and look at the Databases attached ... I guess the File you want to attach is already attached under a different name. Detach that instance first and then your Connection should work. It's not possible to attach the same File using different Database names. The File Extension does not matter.
I have developed c# WPF application, I am using MDF file for database,
my connection string looks like :
Data
Source=(LocalDB)\v11.0;AttachDbFilename=|DataDirectory|\appDataBase.mdf;Integrated
Security=True;Connect Timeout=30
here I am replacing |DataDirectory| with user's appdata folder.
the database file is in user's appdata folder, I created a setup which
copies .mdf file to _users appdata folder when I install it in
client's computer, it works perfectly
but when I uninstalls and
reinstall it, I am not able to connect that file, getting the error:
Can't open database
"C:/users/myusername/appdata/roaming/myapplication/database/appDataBase.mdf"
requested by login, login failed, login failed for user..
File is there, but somehow it is used by SQL server and can't
open it. also while starting application every time I am creating
backup of that file, that one also failing with error
System.IO.IOException: The process cannot access the file
'C:\Users\myusername\AppData\Roaming\myapplication\Database\appDataBase.mdf'
because it is being used by another process.
Can anybody give me exact solution, because i have to use localdb only on my client computer , i don't want them let to do any extra configuration for installation of my app, i.am still facing iasue after i changed my code to close db connection on main window closing event.
This type of things happens because one of your object which is using that database is still running in the background so please dispose all the database related instance also dispose and close all the database related object in catch().
Try catch will help you to detect exact line number where you are getting error and also show due to which object you are getting error.
If you want to check why this is happening then open task manager and look out for services there you definitely find service which is holding object for database.
Can someone help me with this error please? I can't figure it out. I have this error on Windows XP but not on Windows 7. What I did is i attached a photo and save it to the database (MS Access as my database). The photo appears on the picture box but then after that all is a mess. Im using C#.
Your data file is an accdb file, thus requiring the ACE provider instead of the JET provider. Use the JET provider to read mdb or xls files. The ACE provider, on the hand, can read mdb, accdb, xls, xlsx, plus other formats.
Also, it is best to specify complete path to you file in the Data Source property of your connection string.
Do check that the path point to a mdb in the App_Data folder
Not very sure but if the database is inside the App_Data folder, simply use:
"PROVIDER=Microsoft.Jet.OLEDB.4.0;Data Source=|DataDirectory|StaffingSystem_DB.mdb"
Goto Project properties->Publish->Application File, in the applications file window change Publish Status of something.accdb from Include(Auto) to Data File
I was trying out making a website with asp.net to see how data binding works but when I launch the application, it throws this error.
Failed to generate a user instance of SQL Server due to failure in
retrieving the user's local application data path. Please make sure
the user has a local user profile on the computer. The connection will
be closed.
I checked the internet and I found a lot of possible solutions but none of them worked for me.
I created a custom database in the App_Data folder of the project and the connection string is
Data Source=.\SQLEXPRESS;AttachDbFilename=|DataDirectory|\Database.mdf;Integrated Security=True;User Instance=True
It cannot locate the data file at the specified path, or the user does not have sufficient privileges to access the data file.
If the database is set up for Windows Authentication Mode, you should try changing your connection string to something like this:
Server=<COMPUTER NAME>\SQLEXPRESS;Database=<DATABASE NAME>;Trusted_Connection=True;
OR
Server=<COMPUTER NAME>\SQLEXPRESS;AttachDbFilename=<DIRECTORY PATH>\<FILE NAME>.mdf;Trusted_Connection=True;