How to retrive unread emails using POP3

public void Main()
{
    int start = int.parse(Request.QueryString("start"));
    int count = int.parse(Request.QueryString("count"));
    List<string> subjects = new List<string>();
    subjects = getSubjects(start, count);

    //Do whatever with the results...
    //
}
public List<string> getSubjects(int startItem, int endItem)
{
	Pop3Client popp = new Pop3Client("user@mail.com", "*******", "pop3.mail.com");
	popp.AuthenticateMode = Pop3AuthenticateMode.Pop;
	popp.Port = 110;

	popp.Authenticate();
	List<string> msglist = new List<string>();

	if (popp.State == Pop3ConnectionState.Authenticated) {
		int totalmsgs = popp.GetTotalMessageCount();
		int endItem = countItems + startItem;
		if (endItem > totalmsgs) {
			endItem = totalmsgs;
		}

		if (totalmsgs > 0) {
			for (int index = startItem; index <= endItem; index++) {
				Pop3Message msg = popp.GetMessage(index);
				msglist.Add(msg.Subject);

			}

			popp.Close();
		}
	}
	return msglist;
}