Secure way way to perform SQL query in C# class library?

public class GetStuff : IDisposable {

      public string? name;


      public void Dispose() {
          //throw new NotImplementedException();
      }

      public GetStuff() {

              Console.WriteLine("Connecting to Server...");

              ConnectionGetter.con.Open();

              String _select = "SELECT stuff FROM information;";
              ConnectionGetter.command = new MySqlCommand(_select, ConnectionGetter.con);

              MySqlDataReader _read = ConnectionGetter.command.ExecuteReader();
              while (_read.Read()) {
                  name = _read.GetString(0);
              }
              _read.Close();
      }

String myUsername = "";
     using(GetStuff gs = new GetStuff()) {
         myUsername = gs.name;
     }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using MySql.Data.MySqlClient;

namespace officialAPIFS {
    public class ConnectionGetter {
        private static string access = System.Configuration.ConfigurationManager.ConnectionStrings["CONNECTIONSETUP"].ConnectionString;
        public static MySqlConnection con = new MySqlConnection(access);
        public static MySqlCommand command;
    }
}