如何使用c#运行SQL代码？

using System;
using System.Data.SqlClient;

namespace RunSQLCode
{
    class Program
    {
        static void Main(string[] args)
        {
            string connectionString = "Server=localhost;Database=myDatabase;User Id=myUsername;Password=myPassword;";
            string sqlQuery = "SELECT * FROM myTable";

            using (SqlConnection connection = new SqlConnection(connectionString))
            {
                SqlCommand command = new SqlCommand(sqlQuery, connection);
                connection.Open();

                SqlDataReader reader = command.ExecuteReader();

                while (reader.Read())
                {
                    Console.WriteLine(reader["columnName"]);
                }

                reader.Close();
            }
        }
    }
}