In IServiceIncident.cs [ServiceContract] public interface IServiceIncident { [OperationContract] List<clsApplicationsList> mFnGetApplicationsList(); [OperationContract] List<clsProgramList> mFnGetProgramsList(); } And have corresponding classes defined correctly as… [DataContract] public class clsApplicationsList { public string _AppName = ""; [DataMember] public string Prp_AppName { get { return _AppName; } set { _AppName = value; } } In IServiceIncident.svc.cs public class ServiceIncident : IServiceIncident { public List<clsApplicationsList> mFnGetApplicationsList() { try {} public List<clsProgramList> mFnGetProgramList() { } __------------------------------------------ Here I am getting error in svc.cs file as "Error 1 ...Web.ServiceIncident' does not implement interface member '...Web.IServiceIncident.mFnGetProgramsList()' ...Web\ServiceIncident.svc.cs 13 18 ...Web" Any suggestion why this is happening… Please guide. Thanks Sreenath |