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modifiedRecords is some kind of collection of CsvRecordJUpdatedRecordJUpdatedRecord inherits CsvRecord or defines an implicit cast to it, that can't workS
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List<CsvRecord> modifiedRecords = new List<CsvRecord>();JCsvRecordsJUpdatedRecordsSJJJcannot convert from 'IP_Convert.MainWindow.UpdatedRecord' to 'IP_Convert.MainWindow.CsvRecord'JJJUpdatedRecord you need to make it a list of UpdatedRecordSSJUpdatedRecord into a CsvRecord, they're completely different types of objectsJJJmodifiedRecords and what is newRecord?SSJJnewRecord?SJUpdatedRecord a CsvRecord?SSJPJUpdatedRecord to a List<CsvRecord>modifiedRecordsmodifiedRecordsCsvRecordCsvRecordCsvRecordCsvRecordCsvRecordUpdatedRecordUpdatedRecordUpdatedRecordUpdatedRecordUpdatedRecordUpdatedRecordUpdatedRecordUpdatedRecordList<CsvRecord> modifiedRecords = new List<CsvRecord>();cannot convert from 'IP_Convert.MainWindow.UpdatedRecord' to 'IP_Convert.MainWindow.CsvRecord'newRecordnewRecordList<CsvRecord>modifiedRecords.Add(newRecord);