Monitor your Web Services usage via .NET SOAP Extensions

using System;
using System.IO;
using System.Text;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Data.SqlClient;
using System.Data;
using WSDM_WebServices;
namespace UserValidation
{
	/// <summary>
	/// Summary description for UserValidationExtension.
	/// </summary>
	/// 
	// configuration parameter

	public class UserValidationExtension : SoapExtension
	{
		private string connectionString;

		public override object GetInitializer(System.Type serviceType)
		{
			return null;
		}

		public override object GetInitializer(LogicalMethodInfo methodInfo,
			SoapExtensionAttribute attribute)
		{
			WSDM_Configuration config = new WSDM_Configuration();
			config.connectionString = System.Configuration.ConfigurationSettings.AppSettings.Get("ConnectionString");
			return config;
		}

		public override void Initialize(object initializer)
		{
			WSDM_Configuration param = (WSDM_Configuration)initializer;
			connectionString = param.connectionString;
			return;
		}

		public override void ProcessMessage(System.Web.Services.Protocols.SoapMessage message)
		{
			switch(message.Stage)
			{
				case SoapMessageStage.BeforeSerialize:
					break;

				case SoapMessageStage.AfterSerialize:
					break;

				case SoapMessageStage.BeforeDeserialize:
					break;

				case SoapMessageStage.AfterDeserialize:
					// Initialize the RegKey
					string regKey = "";
					try
					{
						// Loop through the Soap headers in the message
						foreach (SoapHeader aHeader in message.Headers)
						{
							// If it's our header (decalared in DBManager), 
							// get the RegisterationKey and assign it to RegKey
							if (aHeader is ClientMessageHeader)
							{
								ClientMessageHeader newHeader = (ClientMessageHeader)aHeader;
								regKey = (string)newHeader.RegistrationKey;	
							}
						}
						// If RegKey is still blank, throw a SOAP exception
						if (regKey == "" || regKey == null)
							throw new CustomSoapException("No registration key supplied");

						// Call ValidateUser, and throw an exception if not successful
						if (ValidateUser(message.MethodInfo.Name,regKey) == 0)
							return;
						else
							throw new CustomSoapException("Invalid account details supplied");
					}
					catch(CustomSoapException ex) 
					{
						throw ex;
						// not shown here but its a good idea to log the exceptions for any further investigations needed
					}

					catch(SoapException ex) 
					{
						throw new SoapException("Unknown error encountered", SoapException.ServerFaultCode);
						// not shown here but its a good idea to log the exceptions for any further investigations needed
					}
					catch(Exception ex)
					{	
						throw new SoapException("Unknown error encountered", SoapException.ServerFaultCode);
						// not shown here but its a good idea to log the exceptions for any further investigations needed

					}

					
			}
		}

		private int ValidateUser(string serviceName, string RegKey)
		{
			DBManager db = new DBManager(connectionString);
			int x = db.ValidateUser(serviceName, RegKey);
			return x;
		}

	}
}