Datareader to list, user and Addresses class, is this a good approach?

public class User
{
    public int ID { get; set; }
    public string Name { get; set; }
    public string Surname { get; set; }
    public List<Address> Addresses { get; set; }
}

public class Address
{
    public int ID { get; set; }
    public string Name { get; set; }
}

public class UserData
{
    public static List<User> GetList()
    {
        List<User> lst = new List<User>();

        using (SqlConnection conn = new SqlConnection(Data.GetConn()))
        {
            using (SqlCommand cmd = conn.CreateCommand())
            {
                if (conn.State == ConnectionState.Closed)
                    conn.Open();

                cmd.CommandText = "select ID,Name,Surname from Users";                

                using (SqlDataReader rdr = cmd.ExecuteReader())
                {
                    while (rdr.Read())
                    {                       
                        User item = new User() {
                            ID = Convert.ToInt32(rdr["ID"]),                            
                            Name = rdr["Name"].ToString(),
                            Surname = rdr["Surname"].ToString(),                                                       
                        };

                        lst.Add(item);
                    }
                }
            }
        }

        return lst;
    }
    
    public static List<Address> GetListA(int UserID)
    {
        List<Address> lst = new List<Address>();

        using (SqlConnection conn = new SqlConnection(Data.GetConn()))
        {
            using (SqlCommand cmd = conn.CreateCommand())
            {
                if (conn.State == ConnectionState.Closed)
                    conn.Open();
               
                cmd.CommandText = "select ID,Name from Addresses where UserID=@UserID";      
                cmd.Parameters.AddWithValue("@UserID", UserID);          
                               
                using (SqlDataReader rdr = cmd.ExecuteReader())
                {
                    while (rdr.Read())
                    {
                        Address item = new Address()
                        {
                            ID = Convert.ToInt32(rdr["ID"]),
                            Name = rdr["Name"].ToString(),
                        };

                        lst.Add(item);
                    }
                }
            }
        }

        return lst;
    }
}

protected void Page_Load(object sender, EventArgs e)
{
    List<User> user = new List<User>();

    user = UserData.GetList();

    foreach (User itemU in user)
    {
        Response.Write(itemU.Name);

        itemU.Addresses = UserData.GetListA(itemU.ID);

        foreach (Address itemA in itemU.Addresses)
        {
            Response.Write(itemA.Name);
        }
    }
}