How to use FTP class GetFileList?

[kjon]

Hi, I'm trying on an FTP class which I don't who's the original author.
It has a method "GetFileList" to return a string array containing the remote
directory's file list.

I need to know the files/folders exist in the FTP site. Does anyone have any
idea how to use this method? Any sample on using this would be much
appreciated.
Below are the codes of the method for reference. Thanks in advance.

----------------------------------------------------------------------------
-------
public string[] getFileList(string mask)
{
if(!logined)
{
login();
}

Socket cSocket = createDataSocket();
sendCommand("NLST " + mask);
if(!(retValue == 150 || retValue == 125))
{
throw new IOException(reply.Substring(4));
}
mes = "";
while(true)
{
int bytes = cSocket.Receive(buffer, buffer.Length, 0);
mes += ASCII.GetString(buffer, 0, bytes);

if(bytes < buffer.Length)
{
break;
}
}

char[] seperator = {'\n'};
string[] mess = mes.Split(seperator);

cSocket.Close();
readReply();

if(retValue != 226)
{
throw new IOException(reply.Substring(4));
}
return mess;
}