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C# Protect newly created Access Catalog with workgroup file

I'm trying to protect a Access database by using a workgroup file as user-security. The file must be in the same folder as the database and you must enter a user name and password to access the database. I read something about the parameter "System Database" in connectionString, but I'm not sure how to use it.
The database is created like this:
String accessConnectionString = "Provider=Microsoft.JET.OLEDB.4.0;Data Source=" + filepath";
using (OleDbConnection accessConnection = new OleDbConnection(accessConnectionString))
{
ADOX.Catalog cat = new ADOX.Catalog();
cat.ActiveConnection.Close();
var newCreatedCatalog= cat.Create(accessConnectionString);
OleDbCommand oleCommand = new OleDbCommand();
// fill database
}

Local Database after publishing C#

i'm trying to make is so my program can have a local database after i have published it. Now i want it to work so i can install in on any computer so i have to change my connection string but i can't seem to figure out to what to change it to this is my connection string i have now
string constring = "Data Source = (LocalDB)\\MSSQLLocalDB; AttachDbFilename = \"C:\\Barcode\\Application Files\\Barcode Scanning_1_0_0_0\\BarcodeDB.mdf\"; Integrated Security = True";
Before publishing i have went into applicationfiles and made sure that BarcodeDB.mdf is included but from what i've seen it changes to BarcodeDB.mdf.deploy after i've published it.
I've also went into Prerquisites and added
SQL Server 2012 Express LocalDB
When i try to run the published program or the debugger with the code i have now i get the error:
An attempt to attach an auto-named database for file C:\Barcode\Application Files\Barcode Scanning_1_0_0_0\BarcodeDB.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share
I'm guessing i need to use:
| DataDirectory |
But i'm new to all of this so i can't seem to figure it out how to use it even after searching for it so i would deeply appreciate it if someone could be kind to eiter explain how i chould be using DataDirectory or if i'm wrong and should be using something else.
And also sorry if i structured this question badly trying to get better at it
Best Regards Hannes.
Edit 1: Here is the code where i try to connect and using the database
string constring = $"Data Source = (LocalDB)\\MSSQLLocalDB; AttachDbFilename = \"{Application.ExecutablePath.ToString()}\\Application Files\\Barcode Scanning_1_0_0_0\\BarcodeDB.mdf\"; Integrated Security = True";
string Query = "SELECT Name FROM Products ORDER BY EDate;";
SqlConnection conDataBase = new SqlConnection(constring);
SqlCommand cmdDataBase = new SqlCommand(Query, conDataBase);
SqlDataReader myReader;
try
{
conDataBase.Open();
myReader = cmdDataBase.ExecuteReader();
while (myReader.Read())
{
string sName = myReader.GetString(myReader.GetOrdinal("Name"));
cbxProducts.Items.Add(sName);
cbxProducts.Sorted = false;
}
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}

Ok I assume that your project is a Windows Forms or WPF project if it's not please tell me.
Your problem is that you are hard-coding a path to a database file which may not exist or your process can't have access to it's location. What you have found as | DataDirectory | is to use in web projects Web.Config file which will be mapped to App_Data folder.
In your case you have to build the connection string using your own applications executable path. Try this code:
//WPF:
string constring = $"Data Source = (LocalDB)\\MSSQLLocalDB; AttachDbFilename = \"{System.Reflection.Assembly.GetExecutingAssembly().Location}\\BarcodeDB.mdf\"; Integrated Security = True";
//Windows Forms:
string constring = $"Data Source = (LocalDB)\\MSSQLLocalDB; AttachDbFilename = \"{Application.ExecutablePath.ToString()}\\BarcodeDB.mdf\"; Integrated Security = True";

string constring = $"Data Source=(LocalDB)\\MSSQLLocalDB;AttachDbFilename=" + Directory.GetCurrentDirectory().ToString() + "\\BarcodeDB.mdf;Integrated Security=True";
This fixed it for me

Programmatically modifying the file path location for a C# SMO created database?

I am trying to programmatically create a new database using SMO in C#. For this project, I do not want the .mdf/.ldf files placed in the default folder
"C:\Program Files\Microsoft SQL Server\MSSQL10_50.SQL2008R2\MSSQL\DATA". I have not found anything on the web that tells how to modify the setting for the file location.
I get a failed operation exception when I run the following code:
Server srv = new Server(serverName.Text);
var db = new Database(srv, dbName.Text);
db.Create();
DataFile df = new DataFile(db.FileGroups["PRIMARY"],
dbName.Text, pathText.Text + dbName.Text + "_data.mdf");
df.Create();
LogFile lf = new LogFile(db, "Log01", pathText.Text + dbName.Text + "_log.ldf");
lf.Create();
The exception occurs at the df.Create(); line.
Any ideas?

I think this one answers the question for you.
Use SMO to Change SQL Server Database Default Locations
TTRider's Answer was:
You need to add information about Data and Log files explicitly:

TTRider's answer in the linked question points in the right direction, but is incomplete. Using some additional info from this post I was able to get it working (tested with SMO 2016 libraries).
private void CreateDatabase(string connectionString, string databaseName, string dataFilePath)
{
using (SqlConnection sqlConnection = new SqlConnection(connectionString))
{
ServerConnection serverConnection = new ServerConnection(sqlConnection);
Server sqlServer = new Server(serverConnection);
Database smoDatabase = new Database(sqlServer, databaseName);
string dataFileName = string.Format("{0}_Data", databaseName);
string dataFileFullPath = Path.ChangeExtension(Path.Combine(dataFilePath, dataFileName), ".mdf");
string logFileName = string.Format("{0}_Log", databaseName);
string logFileFullPath = Path.ChangeExtension(Path.Combine(dataFilePath, logFileName), ".ldf");
FileGroup fileGroup = new FileGroup(smoDatabase, "PRIMARY");
smoDatabase.FileGroups.Add(fileGroup);
DataFile dataFile = new DataFile(fileGroup, dataFileName, dataFileFullPath);
dataFile.IsPrimaryFile = true;
fileGroup.Files.Add(dataFile);
LogFile logFile = new LogFile(smoDatabase, logFileName, logFileFullPath);
smoDatabase.LogFiles.Add(logFile);
smoDatabase.Create();
serverConnection.Disconnect();
}
}

Opening Access Database with C#

I have this connection string :
OleDbConnection con = new OleDbConnection(#"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=..\Release\DB.accdb"); // Database Connection
I want my program to connect to the database without the "..\Release\" in the string.
What I mean is, that i want the program to look for the database in the program's folder, without specifying the folder's name (whatever the folder's name is).
How is that done?

You should add your DB to the project (Add -> Existing Item...) and set Build Action to Content and Copy to Output Directory to Copy always:
After that you can using following connection string:
string cs = #"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=test.mdb;Persist Security Info=False;";
Following code, will find database file in program folder or sub-folder:
string programPath = System.IO.Directory.GetParent(System.Reflection.Assembly.GetExecutingAssembly().Location).FullName;
var dbPath = System.IO.Directory.GetFiles(programPath, "*.accdb", SearchOption.AllDirectories).FirstOrDefault();
string cs = null;
if (!string.IsNullOrEmpty(dbPath))
{
cs = string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Persist Security Info=False;", dbPath);
}

Perhaps you could use something like
String strAppDir = System.IO.Path.GetDirectoryName(
System.Reflection.Assembly.GetExecutingAssembly().GetName().CodeBase);
String strFullPathToMyFile = System.IO.Path.Combine(strAppDir, "DB.accdb");
ref:
How to: Get the Application Directory

C# - Get file path from connection string

Is there an existing method in C# to extract the file path from a string that represents a ConnectionString to a SqlCE .sdf file? I want to check if the file exists at initialization and back it up if the file has been modified.
Sample connection string:
strConn = "Data Source=|DataDirectory|\dbAlias.sdf";

You can use SqlCeConnectionStringBuilder class to parse existing Sql Compact connection string.

A bit late perhaps, but I came across this question wile struggling with the same problem. You can find the location of the |DataDirectory| folder with AppDomain.CurrentDomain.GetData("DataDirectory"). So your connectionstring can be translated like this:
strConn .Replace("|DataDirectory|", AppDomain.CurrentDomain.GetData("DataDirectory").ToString())

You could just create the connection and get the data source from it as a property:
string data;
using (var conn = new SqlConnection(connectionString)) {
data = conn.DataSource;
}

For LocalDB and SqlConnection (not CE):
public static string GetFilePathFromConnectionString(string connectionString)
{
var attachDbFileName = new SqlConnectionStringBuilder(connectionString).AttachDBFilename;
return attachDbFileName.Replace("|DataDirectory|", AppDomain.CurrentDomain.GetData("DataDirectory").ToString());
}