Cannot open database “…” requested by the login. The login failed. Login failed for user '…'

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I have created the setup file for a project (already have all of .mdf and .ldf files). When I install on my PC, it's OK. But If I bring to another PC, Install --> OK, but Run --> get the error

C#

Cannot open database "Standing" requested by the login. The login failed. Login failed for user "(name of PC)"

In source code, I use 3 databases with 3 connectionString like this:

C#

public void LoadDB()
{
    conDB = new SqlConnection();
    conDB.ConnectionString = @"Data Source=.\SQLEXPRESS;
                  AttachDbFilename=C:\EPL.mdf;
                  Integrated Security=True;
                  Connect Timeout=30;
                  User Instance=True";
    conDB.Open();

    conFix = new SqlConnection();
    conFix.ConnectionString = @"Data Source=.\SQLEXPRESS;
                  AttachDbFilename=C:\Fixtures.mdf;
                  Integrated Security=True;
                  Connect Timeout=30;
                  User Instance=True";
    conFix.Open();

    conStan = new SqlConnection();
    conStan.ConnectionString = @"Data Source=.\SQLEXPRESS;
                  AttachDbFilename=C:\Standing.mdf;
                  Integrated Security=True;
                  Connect Timeout=30;
                  User Instance=True";
    conStan.Open();
}

What should I do?

Posted 29-Dec-15 19:15pm

Member 12035413

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Arthur V. Ratz · Answer 1 · 2015-12-29T19:31:00

Solution 1

1. If it's Microsoft SQL Server Express you should try the following:

Server=(localdb)\v11.0;Integrated Security=true;
AttachDbFileName=C:\MyFolder\MyData.mdf;

C#

public void LoadDB()
{
    conDB = new SqlConnection();
    conDB.ConnectionString = @"Server=(localdb)\v11.0;
                  Integrated Security=True;
                  AttachDbFilename=C:\EPL.mdf";
    conDB.Open();
}

This should work for you.

2. Do you use SQL server or Windows authentication ? If you're using SQL server authentication
in your connection string I believe that you should also provide: User ID=myUsername; Password=myPassword; :

C#

public void LoadDB()
{
    conDB = new SqlConnection();
    conDB.ConnectionString = @"Server=(localdb)\v11.0;
                  Integrated Security=True;
                  AttachDbFilename=C:\EPL.mdf;
                  User ID=myUsername;
                  Password=myPassword";
    conDB.Open();
}

Posted 29-Dec-15 19:31pm

Arthur V. Ratz

Comments

Member 12035413 30-Dec-15 2:38am

sorry but I'm using Windows authentication, can you help me?

Arthur V. Ratz 30-Dec-15 2:55am

Yes, sure, I can help you to workaround this problem. Since you're using SQL server authentication you have to provide User ID=myUsername; Password=myPassword; in your connection string as it has been shown above. Also, make sure that your user account has an appropriate permision to manage the database object.

Arthur V. Ratz 30-Dec-15 2:57am

if the solution that I've posted works for you, just let me know.

Member 12035413 30-Dec-15 3:53am

It's not work. When I use your code, I get this error

Database 'C:\EPL.MDF" cannot be upgraded because it is read-only, has read-only files or the user does not have permissions to modify some of the files. Make the database or files writeable, and return recovery
An attemp to attach an auto-named database for file C:\EPL.mdf failed. A database with the same name exists, or specified file cannot be opened, or it is located on UNC share

Arthur V. Ratz 30-Dec-15 6:23am

1. Check the exact path to the database file EPL.mdf (It's recomended that you use the fully qualified path string just for testing purposes;

2. Try to either change permissions to the database by changing the attributes of a role the user belongs to, or try to convert the database by exporting the data base into plain SQL-file and than try to recreate it with the new permissions using that SQL-file;

That's all. If it works or not, just let me know. Thanks.