How to Convert DataReader to DataTable

string connString = ConfigurationManager.ConnectionStrings["NorthwindConn"].ConnectionString;

        SqlConnection conn = new SqlConnection(connString);

        string query = "SELECT * FROM Customers";

        SqlCommand cmd = new SqlCommand(query, conn);

        conn.Open();

        SqlDataReader dr = cmd.ExecuteReader(CommandBehavior.CloseConnection);

        DataTable dt = new DataTable();

        dt.Load(dr);

        conn.Close();