A developers guide to handling exceptions in BizTalk Server 2006/2009/2010

using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Diagnostics;
using System.Web;
using System.Web.Caching;
using System.Web.Services;
using System.Xml;

namespace PersistStoreMessage
{
	/// <summary>
	/// Summary description for Service1.
	/// </summary>
	public class Persist : System.Web.Services.WebService
	{
		public Persist()
		{
			//CODEGEN: This call is required by the ASP.NET Web Services Designer
			InitializeComponent();
		}

		#region Component Designer generated code
		
		//Required by the Web Services Designer 
		private IContainer components = null;
				
		/// <summary>
		/// Required method for Designer support - do not modify
		/// the contents of this method with the code editor.
		/// </summary>
		private void InitializeComponent()
		{
		}

		/// <summary>
		/// Clean up any resources being used.
		/// </summary>
		protected override void Dispose( bool disposing )
		{
			if(disposing && components != null)
			{
				components.Dispose();
			}
			base.Dispose(disposing);		
		}
		
		#endregion

		[WebMethod]
		public bool PersistMessage(string messageId, XmlDocument xDoc)
		{
			try
			{
				this.Context.Cache.Add(messageId, xDoc, null, Cache.NoAbsoluteExpiration, Cache.NoSlidingExpiration, CacheItemPriority.High, null);
				
				EventLog.WriteEntry("Web Service - PersistStoreMessage", "Data written to cache.\nMessage ID: " + messageId + "\n xDoc: " + xDoc.InnerXml);

				return true;
			}
			catch
			{
				return false;
			}
		}

		[WebMethod]
		public XmlDocument RetrieveMessage(string messageId)
		{
			try
			{
				XmlDocument xDoc = (XmlDocument) this.Context.Cache[messageId.ToString()];
				
				this.Context.Cache.Remove(messageId);
				
				return xDoc;				
			}
			catch
			{
				return new XmlDocument();
			}
		}

	}
}