if (!string.IsNullOrEmpty(yt_time_limit_1))

                {

                    entity["yt_time_limit_1"] = Convert.ToDecimal(yt_time_limit_1);

                }

                else

                {

                    entity["yt_time_limit_1"] = "null";

                }

cd.UpdateFaultComponent(entity);

 public bool UpdateFaultComponent(Entity entity)

        {

            StringBuilder strSql = new StringBuilder();

            strSql.Append("update yt_fault_component set ");

            strSql.Append("yt_name='" + entity["yt_name"] + "',");

            strSql.Append("yt_fault_assembly='" + ((EntityReference)entity["yt_fault_assembly"]).Id + "',");

                       strSql.Append("yt_distance_7=" + entity["yt_distance_7"] + "");

            strSql.Append("  where yt_code='" + entity["yt_code"] + "'");

            int rows = Convert.ToInt32(SqlHelper.SQLExecuteScalar(strSql.ToString(), sqlcon));

            return rows > 0 ? true : false;

        }