SqlCommandでReturnValueを取得

using (SqlCommand cmd = cn.CreateCommand()) {
  cmd.CommandType = CommandType.StoredProcedure;
  cmd.CommandText = @"upGetColor";
  cmd.Parameters.Add("@name", SqlDbType.NvarChar).Value = "Red";
  cmd.Parameters.Add("@code", SqlDbType.NvarChar).Direction = ParameterDirection.ReturnValue;
  cmd.ExecuteNonQuery();
  string strColorCode = cmd.Parameters["@code"].Value.ToString();
}