Sending Newsletters from MSMQ Using C# 2.0

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Introduction

Large organizations inform its members about organization events, activities, and other related information through e-newsletters these days. By using Microsoft Visual Studio .NET 2005 and C# 2.0, we can write efficient code to send e-newsletters. In this article, I am going to show how to do that.

Background

In this article, I will use MSMQ (Microsoft Message Queue) for efficiently sending newsletters. For more information regarding MSMQ, please visit http://www.microsoft.com/msj/0798/messagequeue.aspx.

Code

//Required namespaces
using System.Data.SqlClient;
using System.Messaging;
using System.Net.Mail;
using System.Data;

class Newsletter
{
    public Newsletter()
    {
    }

    //This function will send the message to the msmq if the mail server
    //fails to send the email
    private void sendNewsletterMSMQ()
    {
        if (MessageQueue.Exists(@".\private$\Newsletter") == false)
        {
            MessageQueue.Create(@".\private$\Newsletter");
        }

        MessageQueue objQue = new MessageQueue(@".\private$\Newsletter");
        SqlConnection conn = new SqlConnection("server=localhost;uid=sa;" + 
                                 "pwd=password;database=Newsletters;");
        SqlCommand comm = new SqlCommand("SELECT DISTINCT Email " + 
                                         "FROM NewsletterEmails", conn);
        SqlDataReader dr;
        MailAddress from;
        MailAddress to;
        SmtpClient objClient = new SmtpClient();
        objClient.Host = "host";
        objClient.Credentials = new System.Net.NetworkCredential(
                                    "user name", "password");

        try
        {
            conn.Open();
            dr = comm.ExecuteReader(CommandBehavior.CloseConnection);
            while (dr.Read())
            {
                from = new MailAddress("admin@admin.com");
                to = new MailAddress(dr[0].ToString());
                MailMessage objMail = new MailMessage(from, to);
                objMail.Subject = "Newsletter";
                objMail.IsBodyHtml = true;
                objMail.Body = "HTML CODE";

                try
                {
                    objClient.Send(objMail);
                }
                catch
                {
                    objQue.Send(objMail.To[0].Address.ToString());
                }
            }
            dr.Close();
        }
        catch (SqlException sqlEx)
        {
            throw sqlEx;
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }

    //This function will start reading the msmq
    private void readMSMQ()
    {
        MessageQueue objQue = new MessageQueue(@".\private$\Newsletter");
        string[] types = { "System.String" };
        ((XmlMessageFormatter)objQue.Formatter).TargetTypeNames = types;
        objQue.ReceiveCompleted += new ReceiveCompletedEventHandler(queue_ReceiveCompleted);
        objQue.BeginReceive();
    }
 
    //Event handler for the ReceiveCompleted event
    private void queue_ReceiveCompleted(object sender, ReceiveCompletedEventArgs e)
    {
        try
        {
            MessageQueue objQue = new MessageQueue(@".\private$\Newsletter");
            string toAddress = e.Message.Body.ToString();
            sendNewsletterMSMQ(toAddress);
            objQue.BeginReceive();
        }
        catch
        {
        }
    }

    //This function will send the email to the specified address
    private void sendNewsletterMSMQ(string toAddress)
    {
        if (MessageQueue.Exists(@".\private$\Newsletter") == false)
        {
            MessageQueue.Create(@".\private$\Newsletter");
        }

        MessageQueue objQue = new MessageQueue(@".\private$\Newsletter");
        MailAddress from;
        MailAddress to;
        SmtpClient objClient = new SmtpClient();
        objClient.Host = "host";
        objClient.Credentials = new System.Net.NetworkCredential(
                                      "user name", "password");

        try
        {
            from = new MailAddress("admin@admin.com");
            to = new MailAddress(toAddress);
            MailMessage objMail = new MailMessage(from, to);
            objMail.Subject = "Newsletter";
            objMail.IsBodyHtml = true;
            objMail.Body = "HTML CODE";

            try
            {
                objClient.Send(objMail);
            }
            catch
            {
                objQue.Send(objMail.To[0].Address.ToString());
            }
        }
        catch (Exception ex)
        {
            throw ex;
        }
    }
}

Conclusion

By using MSMQ and C# 2.0, we can write code to send newsletters efficiently.

History

• Version 1.0 - 2007.

This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)