Code snippet for ICS attachment creation

EventCalendar.cs

public sealed class EventCalendar
{
    private string _ics;
    public EventCalendar()
    {

    }
    public EventCalendar(string summary, string description, System.DateTime start, System.DateTime end, string location)
    {
        StringBuilder sb;
        try
        {
            sb = new StringBuilder();
            sb.AppendLine("BEGIN:VCALENDAR");
            sb.AppendLine("VERSION:2.0");
            sb.AppendLine("PRODID:learn.med.virginia.edu");
            sb.AppendLine("CALSCALE:GREGORIAN");
            sb.AppendLine("METHOD:PUBLISH");
            sb.AppendLine("BEGIN:VEVENT");
            sb.AppendLine("DTSTART:" + start.ToString("yyyyMMddTHHmm00"));
            sb.AppendLine("DTEND:" + end.ToString("yyyyMMddTHHmm00"));
            sb.AppendLine("DTSTAMP:" + DateTime.Now.ToUniversalTime().ToString("yyyyMMddTHHmm00"));
            sb.AppendLine("UID:" + Guid.NewGuid().ToString());
            sb.AppendLine("CREATED:" + DateTime.Now.ToUniversalTime().ToString("yyyyMMddTHHmm00"));
            sb.AppendLine("SUMMARY:" + summary + "");
            sb.AppendLine("LOCATION:" + location + "");
            sb.AppendLine("DESCRIPTION:" + description + "");
            sb.AppendLine("LAST-MODIFIED:" + DateTime.Now.ToUniversalTime().ToString("yyyyMMddTHHmm00"));
            sb.AppendLine("SEQUENCE:0");
            sb.AppendLine("STATUS:CONFIRMED");
            sb.AppendLine("TRANSP:OPAQUE");
            sb.AppendLine("PRIORITY:3");
            sb.AppendLine("END:VEVENT");
            sb.AppendLine("END:VCALENDAR");
            this._ics = sb.ToString();
        }
        finally
        {
            sb = null;
        }
    }
    public MemoryStream EventStream
    {
        get
        {
            return (MemoryStream)IO.Codepunk.Tools.Stream.StringToStream(this._ics);
        }
    }
}