Exposing Windows Service

using System;
using System.Diagnostics; 
using System.Data;
using System.Data.SqlClient;
using System.Xml;
using System.Collections; 
using System.Xml.Serialization;  
using System.Reflection; 
using System.Management.Instrumentation;  
[assembly:Instrumented("root/MyService")]
namespace WindowsService
{
    public enum eStatus
    {
		Created,
		Populated,
		Sent,
		Received,
		Completed,
		NoRecord,
		Error
    }

	/// <devdoc>
	///    <para>
	///       The WindowsService.Context class handles state info and database interaction
	///       as well as handling the XML serialization requests.
	///    </para>
	/// </devdoc>	
	[ InstrumentationClass(InstrumentationType.Instance) ]
	public class ServiceContext
	{
		private eStatus m_Status = eStatus.Created;

		private string TransactionStatus = "P";
				
		private string m_ResponseDetails = String.Empty;
		
		[XmlElement]
		public string TransactionType;

		[XmlElement]
		public string TransactionXML;

		[XmlElement]
		public string ResponseXML
		{
			set
			{
				if (value!=null)
					PopulateResponse((string)value);
			}
			get
			{
				return m_ResponseDetails;
			}
		}

		[XmlElement]
		public string ErrorSource;

		[XmlElement]
		public string ErrorDescription = String.Empty;

		[XmlElement]
		public string ContextID = String.Empty;

		/// <summary>
		/// Constructor which initializes the object
		/// </summary>
		public ServiceContext() 
		{
			ContextID = String.Empty;
			ErrorSource = String.Empty; 
			ErrorDescription = String.Empty;
			TransactionStatus  = String.Empty; 
			TransactionType  = String.Empty;
			TransactionXML  = String.Empty;
			ResponseXML = String.Empty; 
		}

		/// <summary>
		/// Updates the Context objects status on the SQL database
		/// </summary>
		public int Status
		{
			get {	return (int)m_Status;  }
			set	{	UpdateStatus((eStatus)value);	}
		}

		/// <summary>
		/// Does the actual update removed the database interaction code
		/// </summary>
		/// <param name="oStatus"></param>
		private void UpdateStatus(eStatus oStatus)
		{
			m_Status = oStatus;
			switch (oStatus)
			{
				case eStatus.Populated:
				{
					//Database implementation code
					break;
				}
				case eStatus.Error:
				{
					//Database implementation code
					break;
				}
				case eStatus.Completed:
				{
					//Database implementation code
					break;
				}
				case eStatus.Sent:
				{
					//Database implementation code
					break;
				}
				default:
				{
					break;
				}
			}
		}

		/// <summary>
		/// Parses the Response Xml message and checks the error code and description.
		/// </summary>
		/// <param name="XmlString"></param>
		private void PopulateResponse(string XmlString)
		{
			m_ResponseDetails = XmlString;
			if (XmlString.Length>0)
			{
				XmlDocument doc = new XmlDocument();
				doc.LoadXml(XmlString);
				XmlNode root = doc.DocumentElement; 
				if (root!=null)
				{
					if (root.Name=="ERROR")
					{
						ErrorDescription = root.Attributes["Text"].InnerText;  
						Status = (int)eStatus.Error;
					}
					else if (root.Name!="ACK")
					{
						ErrorDescription = "Response does not conform to recognised Xml layout!";
						m_Status = eStatus.Error;
					}
				}
			}
		}
	}// END CLASS DEFINITION Context
}