Question

Previously I posted a question regarding multithreading. Actually my intension is to send SMS for 1000 (or more) people at a same point of time (Ex: 12:00 AM sharp) by using c# and asp.net application. Is it ok to choose multithreading concept to achieve this?

Answer 1

That concept do not need Multi Threading …

That concept is more of a Task Manager / Cron Job

1. Create an ASPX Script that sees the time and executes the method you need
2. Set up Task Manager to run this script every xx minutes
3. Create a method, that fetches the list of persons and send the SMS through an SMS API, and call it, for ex. SendSMSFromList( List usersList, string message ) {}
4. Now set everything up and you will run this anytime you need (just set it in the ASPX Script)

please, fell free to tell me, if you need any code for this.

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edited for having all steps

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If you have a hosted solution, in your hosting control panel you have something as Task Schedule that you can set up to run your script page every n minutes, if so please by pass the next steps. If, by other hand, you are running your own server (IIS) then do this first.

• Install cUrl for windows from this location and add curl.exe to C:\WINDOWS
• Open Task Manager (Control Panel > Administrative Tools > Task Scheduler on win7)
• Create a new task like this
• Run the command

curl http://localhost/yourApp/taskManager.aspx

with this you just configured your system to run a file, just like if you execute that link in a browser, that will run every 15 minutes.

Now we need to create that taskManager.aspx file

public partial class taskManager : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        DateTime dt = DateTime.Now;

        // Run after midnight
        if (dt.Hour == 0 && dt.Minute <= 15)
        {
            Write2Log("Schedule Job Started", LogType.INFO);

            SendSMSFromList(
                GetUsersList(), 
                GetSMSMessage());

            Write2Log("Schedule Job Finished", LogType.INFO);
        }
    }

    private string GetSMSMessage()
    { 
        // Fetch the text from DB...

        return "This is the message content that I will send as SMS"; 
    }

    private List<string> GetUsersList()
    { 
        // fetch the list form DB...

        return new List<string>(); 
    }

    private void SendSMSFromList(List<string> usersList, string message)
    { 
        // send SMS's
        foreach (string phoneNr in usersList)
        { 
            // send message
            mySMSAPI.Send(phoneNr, message);
        }
    }

    private void Write2Log(string text, LogType type)
    { 
        // Log to a file what's going on...
        try
        {
            string filename = HttpContext.Current.Server.MapPath("") + "\\status.log";
            using (StreamWriter sw = new StreamWriter(filename, true))  // open to append
            {
                // example: 2008-12-17 13:53:10,462 INFO - Schedule Job Finished
                string write = String.Format("{0} {1} - {2}",
                                DateTime.Now,
                                type.ToString(),
                                text);

                sw.WriteLine(write);
            }
        }
        catch (Exception)
        { }
    }

    private enum LogType
    { INFO, WARNING, ERROR }
}

Done…

I made everything in just one file for the sake of the example, you should divide things … but what I was after was to show you the principle of it.