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Hello guys and ladies I want to create a code that will add all my local users from Items from listbox
public void ExistUserList_SelectedIndexChanged(object sender, EventArgs e)
while added local users are in
private void LoadLocalUsers()
to the Logins in Microsoft SQL Server Management Studio.

What I have tried:

I did something like this:
string connectionString = "Data Source=(local);Initial Catalog=master;Integrated Security=True";

            // Użyj 'using' do zapewnienia poprawnego zarządzania zasobami
            using (SqlConnection connection = new SqlConnection(connectionString))

                    foreach (var userName in uniqueUserNames)
                        // Używanie parametrów w zapytaniach SQL
                        string checkUserQuery = "SELECT COUNT(*) FROM sys.server_principals WHERE name = @UserName";
                        SqlCommand checkUserCommand = new SqlCommand(checkUserQuery, connection);
                        checkUserCommand.Parameters.AddWithValue("@UserName", userName);

                        int userCount = (int)checkUserCommand.ExecuteScalar();

                        if (userCount == 0)
                            // Dodawanie nowego użytkownika do bazy danych
                            string addUserQuery = $"CREATE LOGIN [{userName}] FROM WINDOWS";
                            SqlCommand addUserCommand = new SqlCommand(addUserQuery, connection);

                        // Dodawanie użytkownika do roli lub innej kategorii, jeśli to konieczne
                        // Przykładowe zapytanie: 
                        // string addToRoleQuery = $"ALTER SERVER ROLE [localhost] ADD MEMBER [{userName}]";
                        // SqlCommand addToRoleCommand = new SqlCommand(addToRoleQuery, connection);
                        // addToRoleCommand.ExecuteNonQuery();

                catch (Exception ex)
                    // Obsługa błędów
                    MessageBox.Show($"Wystąpił błąd: {ex.Message}", "Błąd", MessageBoxButtons.OK, MessageBoxIcon.Error);
                    // Upewnij się, że połączenie jest zawsze zamykane, nawet jeśli wystąpił błąd
CHill60 14-Dec-23 5:55am    
You have forgotten to ask a question or state a problem
Dave Kreskowiak 14-Dec-23 10:40am    
You've been around here long enough to know that if you don't spell out a problem you're having or ask a specific question, you're not going to get an answer.

The quality of the answers you get is directly dictated by the quality of the questions you ask.

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