Question

How to download all the .csv files with the file name starting with "cash" or "EFT" or "DDR"

Answer 1

// define FileSet
var set = new FileSet("/home/data");
set.Include("cash*.csv");
set.Include("EFT*.csv");
set.Include("DDR*.csv");

// download then delete
client.Download(set, @"C:\data");
client.Delete(set);

// move = after succesfull download delete file immediately
client.Download(set, @"C:\data",  TransferMethod.Move, ActionOnExistingFiles.ThrowException);

Comments

Thanks, Lukas.
Another question I have is below single line download delete the file only if the download is successful?
client.Download(set, @"C:\data",  TransferMethod.Move, ActionOnExistingFiles.ThrowException);

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Yes. The proces goes like this:

for each file
  Download file
  Delete file

If Download file fails or file is skipped, the Delete file is not performed.