Using the treadpool?ThreadPool.QueueUserWorkItem(eu.SendEmailAsync("daddy longlegs", "mcupryk@koretelematics.com"));

  // Respond to the Elapsed event of the timer control
        private void Timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)
        {
            LogMessage.LogMessages("Service Running");
            EmailUtil eu = new EmailUtil();
            eu.HtmlFilePath = @"c:\Temp\readme.htm";
            eu.Subject = "test message";
            eu.SmtpServer = "172.17.1.4";
            eu.FromEmail = "mcupryk@koretelematics.com";
            ///loop here through your datatable etc. of email recipients ---)
            ThreadPool.QueueUserWorkItem(eu.SendEmailAsync("daddy longlegs", "mcupryk@koretelematics.com"));

Error	1	The best overloaded method match for 'System.Threading.ThreadPool.QueueUserWorkItem(System.Threading.WaitCallback)' has some invalid arguments	C:\Inetpub\wwwroot\EmailSubSystemService\EmailSubSystemService\EmailService.cs	100	13	EmailSubSystemService
Error	2	Argument '1': cannot convert from 'string' to 'System.Threading.WaitCallback'	C:\Inetpub\wwwroot\EmailSubSystemService\EmailSubSystemService\EmailService.cs	100	42	EmailSubSystemService
 
--------------------------------------------------------------------------------------------------------
using System;
using System.Data;
using System.Threading;
using System.Runtime.Remoting;
using System.Runtime.Remoting.Messaging;
using System.Text;
using System.Web.Security;
using System.Diagnostics;
using System.IO;
using System.Net.Mail;
 
 
namespace EmailSubSystemService
{
    public class EmailUtil
    {
        private string htmlFilePath;
        public string HtmlFilePath
        {
            get
            {
                return htmlFilePath;
            }
            set
            {
                htmlFilePath = value;
            }
        }
        private string subject;
        public string Subject
        {
            get
            {
                return subject;
            }
            set
            {
                subject = value;
            }
        }
 
        private string smtpServer;
        public string SmtpServer
        {
            get
            {
                return smtpServer;
            }
            set
            {
                smtpServer = value;
            }
        }
 
        private string fromEmail;
        public string FromEmail
        {
            get
            {
                return fromEmail;
            }
 
            set
            {
                fromEmail = value;
            }
        }
 
        public string strBody = String.Empty;
 
        public string SendEmail(string name, string emailAddress)
        {
            if (strBody == String.Empty)
            {
                try
                {
                    using (StreamReader reader = new StreamReader(this.HtmlFilePath))
                    {
                        strBody = reader.ReadToEnd();
                    }
                }
                catch (Exception ex)
                {
                    throw new Exception("error reading HTML File" + ex.Message);
                }
            }
            try
            {
                MailMessage Message = new MailMessage();
                Message.IsBodyHtml =true;
                Message.To.Add(emailAddress);
                Message.From = new System.Net.Mail.MailAddress(this.FromEmail);
                Message.Subject = this.Subject;
                Message.Body = strBody;
                System.Net.Mail.SmtpClient smtp = new System.Net.Mail.SmtpClient(this.SmtpServer);
                smtp.Send(Message);
            }
            catch(SmtpException ehttp)
            {
                throw new Exception("Send error" + ehttp.Message);
            }
            return "sent" + name;
        }
        public delegate string SendEmailDelegate(string name, string emailAddress);
 
        public void GetResultsOnCallback(IAsyncResult ar)
        {
            SendEmailDelegate del = (SendEmailDelegate)
             ((AsyncResult)ar).AsyncDelegate;
            try
            {
                string result;
                result = del.EndInvoke(ar);
                Debug.WriteLine("\nOn CallBack: result is " + result);
            }
            catch (Exception ex)
            {
                Debug.WriteLine("\nOn CallBack, problem occurred: " + ex.Message);
            }
        }
 
        public string SendEmailAsync(string name, string emailAddress)
        {
            SendEmailDelegate dc = new SendEmailDelegate(this.SendEmail);
            AsyncCallback cb = new AsyncCallback(this.GetResultsOnCallback);
            IAsyncResult ar = dc.BeginInvoke(name, emailAddress, cb, null);
            return "ok";
        }
    } // end class EmailUtil 
}

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mathieu_cuprykAsked:
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PablissimoCommented:
You're using a method call as if it's a delegate - and you needn't worry about the threadpool at all.

It should be sufficient to make the call
eu.SendEmailAsync("daddy longlegs", "mcupryk@koretelematics.com")
directly in the timer event without worrying about the threadpool, because your implementation of that method.

The BeginInvoke method of delegates invokes the delegate using a ThreadPool thread automatically - you don't need to supply that logic.

See http://msdn.microsoft.com/en-us/library/2e08f6yc(VS.71).aspx
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