ftps.PutFiles(
    @"C:blablabla*.csv",
    @"blablafolder/test",
    FtpBatchTransferOptions.XCopy,
    FtpActionOnExistingFiles.OverwriteAll);

ftps.PutFiles(
    @"C:blablabla*.csv",
    @"blablafolder/test",
    FtpBatchTransferOptions.Default,
    FtpActionOnExistingFiles.OverwriteAll);