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Session.EnumerateRemoteFiles supports a single mask only. If you need to use multiple masks, you will have to enumerate all files and select those you want yourself in your code.
.csv .xlsx .xls
string FileMask = "*.csv; *.xlsx; *.xls";
var sessionOptions = new SessionOptions
{
Protocol = Protocol.Sftp,
HostName = ConfigurationManager.AppSettings["FtpHost"],
UserName = ConfigurationManager.AppSettings["FtpUsr"],
Password = ConfigurationManager.AppSettings["FtpPwd"],
SshHostKeyFingerprint = ConfigurationManager.AppSettings["SshHostKeyFingerprint"]
};
using (Session session = new Session())
{
session.Open(sessionOptions);
List<string> files =
session.EnumerateRemoteFiles("/", FileMask, EnumerationOptions.AllDirectories)
.Select(fileInfo => fileInfo.FullName)
.ToList();
Console.WriteLine($"Found {files.Count} files");
}