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copied!<p>Your return-type is IEnumerable, so dont use a list. That makes IENumerable useless. Otherwise you dont make use of Lazy-Evaluation See: <a href="http://blogs.msdn.com/b/pedram/archive/2007/06/02/lazy-evaluation-in-c.aspx" rel="nofollow">http://blogs.msdn.com/b/pedram/archive/2007/06/02/lazy-evaluation-in-c.aspx</a></p> <p>better use yield return then:</p> <pre><code>private IEnumerable<SMEntity> ExtractSMData(List<MSExcel.Range> SMData) { foreach (MSExcel.Range Row in SMData) { SMEntity entity = new SMEntity(); entity.IncidentNumber = Row.get_Range("K1").get_Value(); entity.SRNumber = Row.get_Range("L1").get_Value(); entity.SRCategory = Row.get_Range("M1").get_Value(); entity.PickedUpBeforeClient = !Row.get_Range("Q1").get_Value().ToString().ToLowerCase() == "no" entity.RepairedOnTime = !Row.get_Range("W1").get_Value().ToString().ToLowerCase() == "no" entity.SiebelClientCall = EntityConversions.DateTimeConversion(Row.get_Range("N1").get_Value()); entity.SiebelOpenedDate = EntityConversions.DateTimeConversion(Row.get_Range("O1").get_Value()); entity.IncidentOpenDate = EntityConversions.DateTimeConversion(Row.get_Range("P1").get_Value()); entity.OutageStartTime = EntityConversions.DateTimeConversion(Row.get_Range("R1").get_Value()); entity.DetectionPoint = EntityConversions.DateTimeConversion(Row.get_Range("S1").get_Value()); entity.OutageEndTime = EntityConversions.DateTimeConversion(Row.get_Range("U1").get_Value()); entity.MTTR = EntityConversions.ConvertMTTRStringToInt(Row.get_Range("V1").get_Value()); entity.SecondsToDetection = EntityConversions.ConvertDetectionTimeToInt(Row.get_Range("T1").get_Value()); yield return entity; } } </code></pre> <p>You could also write it like this:</p> <pre><code>private IEnumerable<SMEntity> ExtractSMData(List<MSExcel.Range> SMData) { foreach (MSExcel.Range Row in SMData) { yield return new SMEntity { IncidentNumber = Row.get_Range("K1").get_Value(), SRNumber = Row.get_Range("L1").get_Value(), SRCategory = Row.get_Range("M1").get_Value(), PickedUpBeforeClient = !Row.get_Range("Q1").get_Value().ToString().ToLowerCase() == "no" RepairedOnTime = !Row.get_Range("W1").get_Value().ToString().ToLowerCase() == "no" SiebelClientCall = EntityConversions.DateTimeConversion(Row.get_Range("N1").get_Value()), SiebelOpenedDate = EntityConversions.DateTimeConversion(Row.get_Range("O1").get_Value()), IncidentOpenDate = EntityConversions.DateTimeConversion(Row.get_Range("P1").get_Value()), OutageStartTime = EntityConversions.DateTimeConversion(Row.get_Range("R1").get_Value()), DetectionPoint = EntityConversions.DateTimeConversion(Row.get_Range("S1").get_Value()), OutageEndTime = EntityConversions.DateTimeConversion(Row.get_Range("U1").get_Value()), MTTR = EntityConversions.ConvertMTTRStringToInt(Row.get_Range("V1").get_Value()), SecondsToDetection = EntityConversions.ConvertDetectionTimeToInt(Row.get_Range("T1").get_Value()) }; } } </code></pre>

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