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    <p>This is a clear example demonstrating what I've stated on my comment above. It uses lock instead of Mutex but you'll get the point. It's a simple code using multi-threaded Job producers all adding informations to the same (locked) resource and one consumer running once every second to interact with a form control -ListBox in this case- and clear the jobs cache.</p> <p>You'll find further informations here <a href="http://www.albahari.com/threading/part2.aspx" rel="nofollow">http://www.albahari.com/threading/part2.aspx</a></p> <pre><code>public partial class Form1 : Form { static readonly Queue&lt;Job&gt; queue = new Queue&lt;Job&gt;(); public Form1() { InitializeComponent(); //starts the timer to run the ProcessJobs() method every second System.Threading.Timer t = new System.Threading.Timer(obj =&gt; { ProcessJobs(); }, null, 5000, 1000); } /// &lt;summary&gt; /// Called by informations producers to add jobs to the common queue /// &lt;/summary&gt; private void AddJob(Job job) { lock (queue) { queue.Enqueue(job); } } /// &lt;summary&gt; /// Common queue processing by the consumer /// &lt;/summary&gt; private void ProcessJobs() { Job[] jobs; lock (queue) { jobs = queue.ToArray(); queue.Clear(); } foreach(Job job in jobs){ this.Invoke(new Action(delegate { listBox1.Items.Add(job.Name); })); } } /// &lt;summary&gt; /// Producer /// &lt;/summary&gt; private void JobsProducer(string name) { for (int i = 0; i &lt; 10; i++) { Random r = new Random(); System.Threading.Thread.Sleep(r.Next(1,10)*50); this.AddJob(new Job(string.Format("Job({0}) n.{1}", name, i))); } } /// &lt;summary&gt; /// Starts the jobs producers /// &lt;/summary&gt; private void button1_Click(object sender, EventArgs e) { for (int i = 0; i &lt; 10; i++) { string producerName = string.Format("Producer{0}", i); new System.Threading.Timer(obj =&gt; { JobsProducer(producerName); }, null, 0, System.Threading.Timeout.Infinite); } } } public class Job { //whatever -informations you need to exchange between producer and consumer private string name; public string Name { get { return name; } } public Job(string name) { this.name = name; } } </code></pre> <p>And here you can find an example using the Dictionary to hold several jobs results:</p> <pre><code>Dictionary&lt;string, string[]&gt; jobs = new Dictionary&lt;string, string[]&gt;(); //adds an array to the dictionary //NB: (array it's not well suited if you don't know the values or the size in advance...you should use a List&lt;string&gt;) jobs.Add("jobNumber1", new string[]{"a","b"}); //gets an array from the dictionary string[] jobNumber1; if (!jobs.TryGetValue("jobNumber1", out jobNumber1)) throw new ApplicationException("Couldn't find the specified job in the dictionary"); </code></pre>
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    1. USDiego De Vita
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    1. COthanks for the trouble. I'd to make my own action/delegate type. (using net2.0) `public delegate void Action();` shouldn't make any different.. I tried to figure out what that code does. So the for-loop calls the amount of jobs i need. And i put all the "stuff" like open webcontrol, get source and so on, into the ProcessJobs(). Am I right?
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    2. CO`ProcessJobs()` gets called once every second. It's supposed to process independently the job instances containing informations to fill the UI controls. Replace `listBox1.Items.Add(job.Name)` with something like `dataGrid.Rows.Add(job.GetDataRow())`. You need to model your own `Job` class and `GetDataRow()` (or whatever you prefer) method according to your data. The job instances will be created and added by the information producers -aka your scraping logic running independently- that for sake of simplicity here I embedded in the `JobsProducer()` method.
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    3. COI get the point now!! :) Thanks man, that helped me alot.
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