Question

Can anyone suggest a better pattern for processing a number of steps like this?

The only other way I can think of now is using exceptions for flow control but I’ve read that it is not advisable because it is basically a goto statement.

if (FileHandler.CheckIfNewFilesExist(sourceFolderPath))
            {
                if (FileHandler.MoveFolder(sourceFolderPath, temporyFolderPath))
                {
                    if (CSVHandler.AppendUniqueIdToCSV(temporyFolderPath, filesToBeAppended))
                    {
                        FileHandler.CopyFolder(temporyFolderPath, finalFolderPath);
                    }
                }
            }

Answer 1

Use &&

if (FileHandler.CheckIfNewFilesExist(sourceFolderPath)
    && FileHandler.MoveFolder(sourceFolderPath, temporyFolderPath)
    && CSVHandler.AppendUniqueIdToCSV(temporyFolderPath, filesToBeAppended))            
{
    FileHandler.CopyFolder(temporyFolderPath, finalFolderPath);
}