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Database on a separate server - backup .bak

I have a database on the server shared on the local network. I would like to write an application that backs up the database from this server, but not on the server, but on the computer from which I started this application. That is, for a better understanding:
The database is on some Windows Server server. I have a laptop that is connected to the same network and has access to a database. On this laptop, I start the app, connect to the database and the .bak file is saved to the laptop, not the server.
At the moment I wrote only so much and unfortunately it doesn't work for me:
private static void CreateDatabaseBackup(string connectionString, string databaseName, string backupFilePath)
{
SqlConnection connection = new SqlConnection(connectionString);
SqlCommand backupCommand = connection.CreateCommand();
backupCommand.CommandText = $"BACKUP DATABASE {databaseName} TO DISK = '{backupFilePath}'";
connection.Open();
backupCommand.ExecuteNonQuery();
connection.Close();
}
This throws me an exception:
System.Data.SqlClient.SqlException: „Cannot open backup device 'C:\Backup\backup.bak'. Operating system error 3(The system cannot find the path specified.).
BACKUP DATABASE is terminating abnormally.”
Probably because of the fact that it is trying to save the file to the server's disk, and it does not have the path specified in the variable backupFilePath
I would like .bak to be saved to the disk of the device firing the application.
How to approach this problem?

C# Exception: RESTORE DATABASE is terminating abnormally

I am trying to restore a database backup file (.bak) to a newly created database using C#. I get the following inner exception:
Cannot open backup device '\GC.bak'. Operating system error 5 (Access is denied.).
RESTORE DATABASE is terminating abnormally
My server is a localDB.
void RestoreDB(string name)
{
var connection = new ServerConnection(Properties.Settings.Default.Well);
var sqlServer = new Server(connection);
var rstDatabase = new Restore();
rstDatabase.Database = name;
rstDatabase.Action = RestoreActionType.Database;
rstDatabase.Devices.AddDevice(AppDomain.CurrentDomain.BaseDirectory + "GC.bak", DeviceType.File);
rstDatabase.ReplaceDatabase = true;
rstDatabase.SqlRestore(sqlServer);
}

By default SQL Server only has access to a few specific places on the server drive (i.e. the default database and backup folder locations). It looks like you are probably trying to restore the file from a non-standard location, so you either need to grant permissions to the service account that SQL server is running under to that directory, or even easier, copy the backup file into the regular backup file location and try again.

Database explorer - Visual C#

I have SQL server 2008 R2 installed with the default instance in my pc. Server name - "GED", Database name -"LOGIN".I want to access this database into my C# winform.
When i tried to add a connection from my C# database explorer (by keeping, Datasource = ".\SQLEXPRESS"),
it's giving me an
error-26-Error locating server/instance.
By keeping Datasource = ".", i am able to add the database, but it's giving me a message database not exists you want to create it?
If I try to add the database by browsing, i am getting a info that i don't have the rights. But i am the administrator.
Please help me to understand this.

Try this
You can use Environment.MachineName + "\\SQLEXPRESS" as below
var connectionString = String.Format("Data Source = {0}\\SQLEXPRESS;Initial Catalog = {1}; Integrated Security=SSPI ", Environment.MachineName, databaseName);

OS error 3 when backing up database

It is a follow-up question to my previous question in the same forum.
I would like to take a backup of my SQL Server database. Here is the code, for the backup in C#.
userConn = new SqlConnection(userdatabase);
userConn.Open();
string UserString;
UserString = "BACKUP DATABASE #DBName TO DISK = #FilePath";
String destPath = DestDirectory + "\\UserDataTable.bak";
SqlCommand cmd = new SqlCommand(UserString, userConn);
cmd.Parameters.AddWithValue("#dbName", userConn.Database);
cmd.Parameters.AddWithValue("#FilePath", destPath);
cmd.ExecuteNonQuery();
cmd.Dispose();
However, it throws an SQLException,
"Cannot open backup device
'D:\BookKeeping\Database\11_01_2013_21_15\Database\UserDataTable.bak'.
Operating system error 3(failed to retrieve text for this error.
Reason: 15105). BACKUP DATABASE is terminating abnormally."
Any Idea, what could be wrong ?
Thanks a lot for your time and your help.

"Operating system error 3" means that the directory was not found. SQL will not create the backup directory for you; you have to manually create it before running the backup command.

Make sure your SqlServer and the location where you want to create a backup is the same system. If you are using sqlServer remotely(Not located in your system) then you can not create a backup in your machine or you can not restore the database taking a .bak from your machine also.

How to copy file from C#.Net

My C#.Net windows Application connects to a SQLServer2005 database and implements database backup functionality.
In my Application,
I try to perform a file copy like this:
<!-- language:lang-csharp -->
File.Copy(Application.StartupPath + "\\dbSTK.mdf", "D:\\dbSTK123.mdf",true);
but it throws an exception with the following message:
" The Process cannot Access the File, because it is being use by another Process"
How can I copy the db file which is already in use?

You cannot copy mdf file while SqlServer is running. Just temporary shut SqlServer down or Detach that database (here) before copying.

Rather that copy the actual MDF, it's probably a better idea to backup the MDF using SQL Server's built in BACKUP command.
The suggestions to detach the database and then copy it are problematic because it takes your database offline.

The server denies inteprocess access to data files. Once it has opened a data file no other process can open one too. That's why your function fails.

You should close all open connections to DB to access the DB file. But generally, you should not touch the database file. You'd better use SQL command to back up the database.
string backupCommandText = "BACKUP DATABASE [<YOUR_DB_NAME>]" +
"TO DISK = N'<BACKUP_PATH>' WITH NOFORMAT, NOINIT, " +
"NAME = N'Web-Full Database Backup', SKIP, NOREWIND, NOUNLOAD, STATS = 10";
SqlCommand cmd = new SqlCommand();
cmd.CommandText = backupCommandText ;
cmd.Connection = conn;
cmd.ExecuteNonQuery();