My own Mailinator in 5 minutes

using System;
using System.Collections.Generic;
using System.Text;

namespace LumiSoft.Net.RTP
{
    /// <summary>
    /// This class represents RTP session/multimedia-session local participant.
    /// </summary>
    /// <remarks>Term <b>participant</b> is not well commented/defined in RTP. In general for single media session <b>participant</b>
    /// is RTP session itself, for multimedia sesssion <b>participant</b> is multimedia session(RTP sessions group).</remarks>
    public class RTP_Participant_Local : RTP_Participant
    {        
        private string                   m_Name                    = null;
        private string                   m_Email                   = null;
        private string                   m_Phone                   = null;
        private string                   m_Location                = null;
        private string                   m_Tool                    = null;
        private string                   m_Note                    = null;
        private CircleCollection<string> m_pOtionalItemsRoundRobin = null;

        /// <summary>
        /// Default constructor.
        /// </summary>
        /// <param name="cname">Canonical name of participant.</param>
        /// <exception cref="ArgumentNullException">Is raised when <b>cname</b> is null reference.</exception>
        public RTP_Participant_Local(string cname) : base(cname)
        {
            m_pOtionalItemsRoundRobin = new CircleCollection<string>();
        }


        #region method AddNextOptionalSdesItem

        /// <summary>
        /// Adds next(round-robined) optional SDES item to SDES chunk, if any available.
        /// </summary>
        /// <param name="sdes">SDES chunk where to add item.</param>
        /// <exception cref="ArgumentNullException">Is raised when <b>sdes</b> is null reference.</exception>
        internal void AddNextOptionalSdesItem(RTCP_Packet_SDES_Chunk sdes)
        {
            if(sdes == null){
                throw new ArgumentNullException("sdes");
            }

            lock(m_pOtionalItemsRoundRobin){
                if(m_pOtionalItemsRoundRobin.Count > 0){
                    string itemName = m_pOtionalItemsRoundRobin.Next();

                    if(itemName == "name"){
                        sdes.Name = m_Name;
                    }
                    else if(itemName == "email"){
                        sdes.Email = m_Email;
                    }
                    else if(itemName == "phone"){
                        sdes.Phone = m_Phone;
                    }
                    else if(itemName == "location"){
                        sdes.Location = m_Location;
                    }
                    else if(itemName == "tool"){
                        sdes.Tool = m_Tool;
                    }
                    else if(itemName == "note"){
                        sdes.Note = m_Note;
                    }
                }
            }
        }

        #endregion


        #region method ConstructOptionalItems

        /// <summary>
        /// Constructs optional SDES items round-robin.
        /// </summary>
        private void ConstructOptionalItems()
        {
            lock(m_pOtionalItemsRoundRobin){
                m_pOtionalItemsRoundRobin.Clear();

                if(!string.IsNullOrEmpty(m_Note)){
                    m_pOtionalItemsRoundRobin.Add("note");
                }
                if(!string.IsNullOrEmpty(m_Name)){
                    m_pOtionalItemsRoundRobin.Add("name");
                }
                if(!string.IsNullOrEmpty(m_Email)){
                    m_pOtionalItemsRoundRobin.Add("email");
                }
                if(!string.IsNullOrEmpty(m_Phone)){
                    m_pOtionalItemsRoundRobin.Add("phone");
                }
                if(!string.IsNullOrEmpty(m_Location)){
                    m_pOtionalItemsRoundRobin.Add("location");
                }
                if(!string.IsNullOrEmpty(m_Tool)){
                    m_pOtionalItemsRoundRobin.Add("tool");
                }                
            }
        }

        #endregion


        #region Properties implementation
                
        /// <summary>
        /// Gets or sets the real name, eg. "John Doe". Value null means not specified.
        /// </summary>
        public string Name
        {
            get{ return m_Name; }

            set{ 
                m_Name = value; 

                ConstructOptionalItems();
            }
        }

        /// <summary>
        /// Gets or sets email address. For example "John.Doe@example.com". Value null means not specified.
        /// </summary>
        public string Email
        {
            get{ return m_Email; }

            set{ 
                m_Email = value; 

                ConstructOptionalItems();
            }
        }

        /// <summary>
        /// Gets or sets phone number. For example "+1 908 555 1212". Value null means not specified.
        /// </summary>
        public string Phone
        {
            get{ return m_Phone; }

            set{ 
                m_Phone = value; 

                ConstructOptionalItems();
            }
        }

        /// <summary>
        /// Gets  or sets location string. It may be geographic address or for example chat room name.
        /// Value null means not specified.
        /// </summary>
        public string Location
        {
            get{ return m_Location; }

            set{ 
                m_Location = value; 

                ConstructOptionalItems();
            }
        }

        /// <summary>
        /// Gets or sets streaming application name/version.
        /// Value null means not specified.
        /// </summary>
        public string Tool
        {
            get{ return m_Tool; }

            set{ 
                m_Tool = value; 

                ConstructOptionalItems();
            }
        }

        /// <summary>
        /// Gets or sets note text. The NOTE item is intended for transient messages describing the current state
        /// of the source, e.g., "on the phone, can't talk". Value null means not specified.
        /// </summary>
        public string Note
        {
            get{ return m_Note; }

            set{ 
                m_Note = value; 

                ConstructOptionalItems();
            }
        }

        // TODO: PRIV

        #endregion

    }
}