c# - How to get the latest added value (with a Condition) from SQL Server DB Using ADO.NET -


i'm trying latest value sql server table correnspending serial(sensor identifier) web api using ado.net. code works fine when put codition latest sensor value crashes , show me error :"an exception of type "system.data.sqlclient.sqlexception..." incorrect syntax near 'ff'" please me , thank's in advance! here code , error:

[httpget]     [actionname("gettemperaturebyserial")]     public dbsensorsvalues get(string sensorserial)     {          sqldatareader reader = null;         sqlconnection myconnection = new sqlconnection();         myconnection.connectionstring = @"data source=pcheds;database=dbcompany;user id=sa;password=hedi;";         //sqlserver2008r2         sqlcommand sqlcmd = new sqlcommand();         sqlcmd.commandtype = commandtype.text;         sqlcmd.commandtext = "select * dbsensorsvalues (serial=" + sensorserial + " , sensorid = (ident_current( 'dbsensorsvalues' )))";         sqlcmd.connection = myconnection;         myconnection.open();         reader = sqlcmd.executereader();         dbsensorsvalues dbcomp = null;         while (reader.read())         {             dbcomp = new dbsensorsvalues();             dbcomp.sensorid = convert.toint32(reader.getvalue(0));             dbcomp.sensortype = reader.getvalue(1).tostring();             dbcomp.value = reader.getvalue(2).tostring();             dbcomp.valuedateadded = reader.getvalue(3).tostring();             dbcomp.serial = reader.getvalue(4).tostring();             dbcomp.sensorname = reader.getvalue(5).tostring();             dbcomp.boxname = reader.getvalue(6).tostring();             dbcomp.sensorsn = reader.getvalue(7).tostring();             //dbcomp.valupdatefreq = convert.toint32(reader.getvalue(8));          }         return dbcomp;         myconnection.close();

here link of how calling web service: http://localhost:57888/api/employees/gettemperaturebyserial?sensorserial=bffdd565-b443-42ff-a1de-e7897b6a9840


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