c# - WCF RESTful Service Error -

hi came accross error , cant figure out how fix it. have restful wcf service trying retrieve data sql server database. thanks.

error   1   'restservice.restserviceimpl.getcompany(string)': not code paths return value  

my coding

restserviceimpl.svc.cs

    public class restserviceimpl : irestserviceimpl     {         public string xmldata(string id)         {             return ("you requested product" + id);         }         public string jsondata(string id)         {             return ("you requested product" + id);         }        //error underlined @ getcompany          public company getcompany(string compid)         {             company comp = new company();             {                 sqlconnection con = new sqlconnection();                 con.connectionstring = "";                 con.open();                 sqlcommand cmd = new sqlcommand("select companyname tblcompany", con);                 con.open();                  sqldatareader reader = cmd.executereader();             }          }     } } 

irestservice.cs

  public interface irestserviceimpl     {         [operationcontract]         [webinvoke(method = "get",             responseformat = webmessageformat.xml,             bodystyle = webmessagebodystyle.wrapped,             uritemplate = "xml/{id}")]         string xmldata(string id);          [operationcontract]         [webinvoke(method = "get",             responseformat = webmessageformat.json,             bodystyle = webmessagebodystyle.wrapped,             uritemplate = "json/{id}")]         string jsondata(string id);          [operationcontract]         [webget(uritemplate = "/getcompany/{compid}",             requestformat = webmessageformat.json,             responseformat = webmessageformat.json)]         company getcompany(string compid);      }      [datacontract]     public class company     {         [datamember]         public string compid { get; set; }          [datamember]         public string company { get; set; }     } } 

you need change method return type of object 'company'

 public company getcompany(string companyname)         {             company comp = new company();             {                 sqlconnection con = new sqlconnection();                 con.connectionstring = "";                 con.open();                 sqlcommand cmd = new sqlcommand("select companyname tblcompany", con);                 con.open();                  sqldatareader reader = cmd.executereader();                 //your implementation             }             return comp ;         }