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I am a programmer Italian, I do not know English well. I hope to explain my problem well.

I develop in C # on a PC with Windows Seven Pro, vs 2010 pro, sql server 2008.

I have problems with the backup operation and the connection string.

The code is as follows:

private void BK()

            string strconn = @"Data Source=.\SQLEXPRESS; AttachDbFilename=|DataDirectory|\db.mdf;Integrated Security=True;User Instance=True"; 

            SqlConnection conn = new SqlConnection();

            conn.ConnectionString = strconn;


                //Query per backup

                string queryBK = "BACKUP DATABASE db TO DISK ='C:\\Program Files\\Microsoft SQLServer\\MSSQL10.SQLEXPRESS\\MSSQL\\Backup\\db.bak' WITH INIT, SKIP, CHECKSUM";

                //Creazione Command   
                SqlCommand cmdBK = new SqlCommand(queryBK, conn);

                // Open connection.


                //Execute command     

                MessageBox.Show("backup effettuato");
            catch (Exception ex)
                // Process exception.

                MessageBox.Show(ex.Message, "ERRORE", MessageBoxButtons.OK, MessageBoxIcon.Error);

This code works on the development PC, but if I install my application on another PC (with Vista) does not work, returned the following error:

"The database does not exist. Verify that the name has been entered correctly. INTERRUPTION

I would stress that this string works well with the operations INSERT, DELETE, UPDATE
on both my PC and on the PC test.

If I replace the connection string with:

string strconn = @"Data Source=.\SQLEXPRESS; Database = db;Trusted_Connection =True";

The string work on my PC but on my test computer returns the following error:

"Can not open database requested by the login. Login failed.
Login failed for user Pina-PC \ Pina "

Someone could help me to solve this problem?
Updated 6-Oct-11 5:46am

1 solution

1) For you to backup a database then that database must exist on the other machine first.
You must have a db.mdf file in your application folder.

2) Integrated security works when your database server is working in Windows mode not in SQL server mode, so you are getting the 'Pina-PC\Pina' user does not exist or does not have access error.

use the following connection string :
string strconn = @"Data Source=.\SQLEXPRESS; Database = db;Trusted_Connection =True;integrated security = sspi;";
Share this answer
Espen Harlinn 6-Oct-11 10:58am    
Nice reply, my 5
Mehdi Gholam 6-Oct-11 11:02am    
Cheers Espen.

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