public int ValidarIdentityCode_Libre(string identityCode) { int Id_User = -1; try { var accessor = new DataAccesor(_connectionString); string ic = accessor.ParameterIdentifierCharacter(); var sql = string.Format(@"select Id from Usuario where IdentityCode = " + ic + "{0}", Arguments.Identity_Code); List <IDataParameter> parameters = new List <IDataParameter>() { accessor.Parameter(Arguments.Identity_Code, identityCode) }; //var ds = accessor.FillDataSet(sql, parameters); Id_User = Convert.ToInt32(accessor.ExecuteScalar(sql, parameters, false)); } catch (Exception ex) { log.Error("ValidarIdentityCode_Libre(IdentityCode: {0})", ex, identityCode); } return(Id_User); }