如何从C#中的数据库中获取用户名和密码？

using System;
using Microsoft.Data.SqlClient;

class Program
{
    static void Main()
    {
        string connectionString = "Server=localhost;Database=myDatabase;User Id=myUsername;Password=myPassword;";
        string query = "SELECT username, password FROM users WHERE id=@id";

        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            SqlCommand command = new SqlCommand(query, connection);
            command.Parameters.AddWithValue("@id", 1); // 假设您要查询ID为1的用户

            try
            {
                connection.Open();
                SqlDataReader reader = command.ExecuteReader();

                if (reader.Read())
                {
                    string username = reader["username"].ToString();
                    string password = reader["password"].ToString();

                    Console.WriteLine($"Username: {username}, Password: {password}");
                }
                else
                {
                    Console.WriteLine("User not found.");
                }

                reader.Close();
            }
            catch (Exception ex)
            {
                Console.WriteLine($"Error: {ex.Message}");
            }
        }
    }
}