Multithreading doesn't work

Question

1.00/5 (2 votes)

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hi,
I just trying to print the 1 to 100 numbers in two list boxes parallel.But...After the first listbox only the second list box starts working.Is my coding has any problem..or multithreading is like this?Please rectify my mistakes in the coding..

C#

private void button1_Click(object sender, EventArgs e)
        {
            int i = 0;
            for (i = 0; i < 100; i++)
            {
                listBox1.Items.Add(i);
                Thread.Sleep(10);
            }
            int j = 0;
            for (j = 0; j < 100;j++)
            {
                listBox2.Items.Add(j);
                Thread.Sleep(10);
            }
          

        }

Thanks

Posted 20-Sep-11 1:04am

sreenathpktr

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Prerak Patel 20-Sep-11 7:11am

This is not multithreading.

Anil Honey 206 20-Sep-11 7:14am

i agree

3 solutions

Solution 2

Your two for loops are executed sequentially. Thread.Sleep only waits 10 ms in between adding two items. This has nothing to do with multithreaded programming. For that you'd have to produce two separate Threads and do the adding from there. Please make sure to use Control.Invoke when accessing GUI elements from within a non GUI thread.

Best Regards,

—MRB

Posted 20-Sep-11 1:13am

Manfred Rudolf Bihy

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Sergey Alexandrovich Kryukov 20-Sep-11 18:03pm

Yes, it was a funny question. As if one could write some code, clap hands and chant "Multithreading, multithreading...". :-)
Hope you explained things. You also should have mentioned BeginInvoke and perhaps Dispatcher.

Anyway, I added some detail to it, please see my solution.
--SA

Solution 3

In addition to the solution by Manfred: please see my recent solution where I explain invocation using both Control and also Dispatcher: Is this correct coding?[^].

—SA

Posted 20-Sep-11 12:01pm

Sergey Alexandrovich Kryukov

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Prerak Patel · Accepted Answer · 2011-09-20T01:12:00

Solution 1

What you are doing is not multithreading.
Check out the links to learn more about it
http://msdn.microsoft.com/en-us/library/aa645740(v=vs.71).aspx[^]
Multithreading in .NET[^]
Multithreading Concepts in C#[^]

Posted 20-Sep-11 1:12am

Prerak Patel

Comments

Manfred Rudolf Bihy 20-Sep-11 7:14am

Nice links!

Prerak Patel 20-Sep-11 7:17am

Thanks :)

Sergey Alexandrovich Kryukov 20-Sep-11 18:04pm

Good links, my 5.
However, OPs confusion is too deep (see my comment to the solution by Manfred :-).
I also added my solution to explain Invoke, please see.
--SA