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creating connection string for attached MDF file

what you see bellow is a part of my WPF project I used it to backup/restore my SQL server database and it works great but; when I want to make a setup file by advanced installer and I move MDF and LDF files created by SQL script to app directory to use in SQL express it doesn't work. Now I want to know what can I do with connection string so that backup/restore prosses can work correctly
private string connectionString = "Data Source=.\\SQLEXPRESS;AttachDbFileName=|DataDirectory|\\DBNBO.mdf;Database=DBNBO; Trusted_Connection=Yes;";
private void BtnBackup_OnClick(object sender, EventArgs e)
{
SqlConnection connection = new SqlConnection(connectionString);
string database = connection.Database;
string query = "Backup Database [" + database + "] To Disk = '" + txtBackup.Text + "\\DB_backup.bak'";
SqlCommand command = new SqlCommand(query, connection);
connection.Open();
command.ExecuteNonQuery();
connection.Close();
}
private void btnRestore_Click(object sender, EventArgs e)
{
SqlConnection connection = new SqlConnection(connectionString);
string database = connection.Database;
if (connection.State != ConnectionState.Open) connection.Open();
string query1 = string.Format("Alter Database [" + database + "] Set Single_User With Rollback Immediate");
SqlCommand command1 = new SqlCommand(query1, connection);
command1.ExecuteNonQuery();
string query2 = string.Format("Use Master Restore Database [" + database + "] From Disk = '" + txtRestore.Text + "' With Replace");
SqlCommand command2 = new SqlCommand(query2, connection);
command2.ExecuteNonQuery();
string query3 = string.Format("Alter Database [" + database + "] Set Multi_User");
SqlCommand command3 = new SqlCommand(query3, connection);
command3.ExecuteNonQuery();
connection.Close();
}

I'm trying to restore a SQL Server database backup with this code :

I'm trying to restore a SQL Server database backup with this code:
private void restoreButton_Click(object sender, EventArgs e)
{
string database = con.Database.ToString();
if (con.State != ConnectionState.Open)
{
con.Open();
}
try
{
string sqlStmt2 = string.Format("ALTER [MangementSystemBD] [" + database + "] SET SINGLE_USER WITH ROLLBACK IMMEDIATE");
SqlCommand bu2 = new SqlCommand(sqlStmt2, con);
bu2.ExecuteNonQuery();
string sqlStmt3 = "USE MASTER RESTORE [MangementSystemBD] [" + database + "] FROM DISK='" + textBox2.Text + "'WITH REPLACE;";
SqlCommand bu3 = new SqlCommand(sqlStmt3, con);
bu3.ExecuteNonQuery();
string sqlStmt4 = string.Format("ALTER [MangementSystemBD] [" + database + "] SET MULTI_USER");
SqlCommand bu4 = new SqlCommand(sqlStmt4, con);
bu4.ExecuteNonQuery();
MessageBox.Show("database restoration done successfully");
con.Close();
}
catch (Exception ex)
{
MessageBox.Show(ex.ToString());
}
}
But when I execute it I get this error:

For restoring database use this code
public void RestoreDatabaseBackup()
{
ExecuteQuery("EXEC msdb.dbo.sp_delete_database_backuphistory #database_name = 'DatabaseName");
ExecuteQuery("USE MASTER");
OpenFileDialog res = new OpenFileDialog();
res.ShowDialog();
if (res.FileName.ToString() == "")
{
//MessageBox.Show("Select Valid .bak File");
}
else
{
try
{
string s = res.FileName.ToString();
SqlConnection sqlConnection = new SqlConnection(#"Data Source=ServerName;Initial Catalog=yourDatabaseName;Integrated Security=True;Pooling=False");
if (sqlConnection.State == System.Data.ConnectionState.Open)
{
sqlConnection.Close();
}
sqlConnection.Open();
ServerConnection ServerConnection = new ServerConnection(sqlConnection);
Server srv = new Server(ServerConnection);
//Declare a BackupDeviceItem by supplying the backup device file name in the constructor, and the type of device is a file.
BackupDeviceItem bdi = default(BackupDeviceItem);
bdi = new BackupDeviceItem(s, DeviceType.File);
// Define a Restore object variable.
Restore rs = new Restore();
//Set the NoRecovery property to true, so the transactions are not recovered.
rs.NoRecovery = true;
rs.ReplaceDatabase = true;
// Add the device that contains the full database backup to the Restore object.
rs.Devices.Add(bdi);
rs.NoRecovery = false;
// Specify the database name.
rs.Database = sqlConnection.Database.ToString();
// Restore the full database backup with no recovery.
sqlConnection.ChangeDatabase("master");
rs.SqlRestore(srv);
// Inform the user that the Full Database Restore is complete.
srv = null;
MessageBox.Show("Database Restore complete.");
}
catch (Exception ex)
{
MessageBox.Show(ex.Message);
}
}
}
ExecuteQuery is a normal method to run SQL you should make it

Can't make SQL Server connection C#

I'm trying to connect to a SQL Server on a local machine, run a SQL command against it and log the results. The code keeps failing at making the connection to the server.
I can't quite see what I'm doing wrong. Everything I've searched for either doesn't apply to this method or seems to match what I'm doing. I think I have other problems in the code as well, but I can't even get past the SQL connection to test the rest. Here is my code:
string svrConnection = "Server=.\\sqlexpress;Database="+db+";User ID=user;Password=password;";
SqlConnection con;
SqlCommand cmd;
Directory.CreateDirectory("C:\\"db"\\");
FileInfo file = new FileInfo("C:\\script.sql");
string PCS = file.OpenText().ReadToEnd();
con = new SqlConnection(svrConnection);
StreamWriter PCSLog = new StreamWriter(#"C:\\" + db + "\\Log" + db + ".txt");
try
{
con.Open();
cmd = new SqlCommand(PCS, con);
cmd.ExecuteNonQuery();
using (SqlDataReader pcsrdr = cmd.ExecuteReader())
using (PCSLog)
{
while (pcsrdr.Read())
PCSLog.WriteLine(pcsrdr[0].ToString() + pcsrdr[1].ToString() + ",");
}
PCSLog.Close();
cmd.Dispose();
con.Close();
}
catch (Exception ex)
{
MessageBox.Show("Can not open connection !", ex.Message);
}

There are additional problems with your code:
The Lines
cmd.Dispose();
con.Close();
are not guaranteed to execute if an exception occurs.
You call PCSLog.Close AFTER after you have disposed of it
I would suggest this as a better alternative (irrespective of the other comments made here).
string svrConnection = "Server=.\\sqlexpress;Database="+db+";User ID=user;Password=password;";
Directory.CreateDirectory("C:\\" + db + "\\");
FileInfo file = new FileInfo("C:\\script.sql");
string PCS = file.OpenText().ReadToEnd();
try
{
using (SqlConnection con = new SqlConnection(svrConnection))
{
con.Open();
using (SqlCommand cmd = new SqlCommand(PCS, con))
{
cmd.ExecuteNonQuery();
using (SqlDataReader pcsrdr = cmd.ExecuteReader())
using (StreamWriter PCSLog = new StreamWriter("C:\\" + db + "\\Log" + db + ".txt"))
{
while (pcsrdr.Read())
PCSLog.WriteLine(pcsrdr[0].ToString() + pcsrdr[1].ToString() + ",");
}
}
}
}
catch (Exception ex)
{
MessageBox.Show("Can not open connection !", ex.Message);
}

I think the issue is your connection string. Try this:
string svrConnection = "Data Source=.\\SQLEXPRESS;Initial Catalog=" + db + ";User Id=user;Password=password;"
Or to get a connection using your windows credentials:
string svrConnection = "Data Source=.\\SQLEXPRESS;Initial Catalog=" + db + ";Trusted_Connection=True;"
Also, ExecuteNonQuery does not run each command separated by GO. You will need to split your query into sections and run each individually.

Data being duplicated in a database on save

I am trying to save some data in a database using an INSERT query but it is saving double value on single click. For example I save 'Lahore', it'll save it two times:
Lahore
Lahore
SqlConnection conn = new SqlConnection("Data Source = HAMAAD-PC\\SQLEXPRESS ; Initial Catalog = BloodBank; Integrated Security = SSPI ");
try
{
conn.Open();
SqlCommand query = new SqlCommand("insert into City values('" + txtCity.Text + "')", conn);
query.ExecuteNonQuery();
SqlDataReader dt = query.ExecuteReader();
if (dt.Read())
{
MessageBox.Show("Saved....!");
}
else
{
MessageBox.Show("Not saved.....");
}
}
catch (Exception ex)
{
MessageBox.Show("Failed....." + ex.Message);
}

Your code is doing exactly what you told it to.
If you call an Execute*() method twice, it will run your query twice.

It's saving twice because you are executing the query twice:
query.ExecuteNonQuery();
SqlDataReader dt = query.ExecuteReader();

You are saving twice.
The executeNonQuery will return the number of rows affected so use this instead.
SqlConnection conn = new SqlConnection("Data Source = HAMAAD-PC\\SQLEXPRESS ; Initial Catalog = BloodBank; Integrated Security = SSPI ");
try
{
conn.Open();
SqlCommand query = new SqlCommand("insert into City values('" + txtCity.Text + "')", conn);
var rowsAffected = query.ExecuteNonQuery();
if (rowsAffected == 1)
{
MessageBox.Show("Saved....!");
}
else
{
MessageBox.Show("Not saved.....");
}
}
catch (Exception ex)
{
MessageBox.Show("Failed....." + ex.Message);
}

Connection string and sql backup

I'm having problem with the following C# code to perform a backup, particularly in 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;
try {
//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";
SqlCommand cmdBK = new SqlCommand(queryBK, conn);
conn.Open();
cmdBK.ExecuteNonQuery();
MessageBox.Show("backup effettuato");
}
catch (Exception ex) {
MessageBox.Show(ex.Message, "ERRORE", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally {
conn.Close();
}
}
This code works on the development PC, but if I install my application on another PC it throws this error:
The database does not exist. Verify that the name has been entered
correctly. INTERRUPTION ANOMALOUS BACKUP DATABASE.
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 works on my dev machine but not on the test machine. It throws the following error:
Can not open database requested by the login. Login failed. Login
failed for user Pina-PC \ Pina

Dear fellow you can use your code in this way.
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;
try {
// First get the db name
conn.Open();
string dbname;
SqlCommand cmd = new SqlCommand();
cmd.Connection = conn;
dbname = cmd.Connection.Database.ToString();
//Query per backup
string queryBK = "BACKUP DATABASE " + dbname + " TO DISK ='C:\\Program Files\\Microsoft SQLServer\\MSSQL10.SQLEXPRESS\\MSSQL\\Backup\\db.bak' WITH INIT, SKIP, CHECKSUM";
SqlCommand cmdBK = new SqlCommand(queryBK, conn);
conn.Open();
cmdBK.ExecuteNonQuery();
MessageBox.Show("backup effettuato");
}
catch (Exception ex) {
MessageBox.Show(ex.Message, "ERRORE", MessageBoxButtons.OK, MessageBoxIcon.Error);
}
finally {
conn.Close();
}
}
this routine will work in your case.