将UserId导入SQLDataSource

using System;
using System.Data;
using System.Data.SqlClient;

class Program
{
    static void Main()
    {
        string connectionString = "Data Source=myServerAddress;Initial Catalog=myDataBase;Integrated Security=True";

        using (SqlConnection connection = new SqlConnection(connectionString))
        {
            connection.Open();

            using (SqlCommand command = new SqlCommand("SELECT UserId FROM Users", connection))
            {
                using (SqlDataReader reader = command.ExecuteReader())
                {
                    while (reader.Read())
                    {
                        int userId = reader.GetInt32(0);
                        Console.WriteLine("UserId: " + userId);
                    }
                }
            }
        }
    }
}