why my progressbar doesn't work in thread?

my code is listed below:

private void button1_Click(object sender, EventArgs e)
{
myProgressBar.Value = 0;

}

private void button2_Click(object sender, EventArgs e)
{
myProgressBar.Value = 50;
}

private void button3_Click(object sender, EventArgs e)
{
myProgressBar.Value = 100;
}

private void button4_Click(object sender, EventArgs e)
{
//thread start
FormTest FormTestobject = new FormTest();
Thread mythreadtest = new Thread(FormTestobject.threadtest);
// 上 程
mythreadtest.Start();
}

private void threadtest()
{
myProgressBar.Value = 0;

for (int i = 0; i < 10; i++)
{
Thread.Sleep(1000);
myProgressBar.Value = i*10;
}

myProgressBar.Value = 100;

}

all the three function to set value of progressbar seperately can work well.but why i start a thread and make it refresh the value doesn't seem to have any work on progress bar

is there anything wrong with it

thanks!

my code is listed below:

private void button1_Click(object sender, EventArgs e)
{
myProgressBar.Value = 0;

}

private void button2_Click(object sender, EventArgs e)
{
myProgressBar.Value = 50;
}

private void button3_Click(object sender, EventArgs e)
{
myProgressBar.Value = 100;
}

private void button4_Click(object sender, EventArgs e)
{
//thread start
FormTest FormTestobject = new FormTest();
Thread mythreadtest = new Thread(FormTestobject.threadtest);
mythreadtest.Start();
}

private void threadtest()
{
myProgressBar.Value = 0;

for (int i = 0; i < 10; i++)
{
Thread.Sleep(1000);
myProgressBar.Value = i*10;
}

myProgressBar.Value = 100;

}

all the three function to set value of progressbar seperately can work well.but why i start a thread and make it refresh the value doesn't seem to have any work on progress bar

is there anything wrong with it

thanks!

thanks, but i don't think this is the cause.

because i didn't set the check illegal crossthreadcall property , and i remember that in .net 2.0, the runtime will check this and tell me when i make a cross thread call.

so...

You can only update the progress bar on the GUI thread that created it. To get around this you should use Control.Invoke.

Hi wenliang,

Try something like the following:

thank you very much .

i'll try it.

but your code snippet hang the UI thread.

when i click on the UI, it not corresponding...

the code will be as simple as this:

but when the button was clicked,the thread is running ,so as the progress bar. if i click the ui , not matter where. it will not responding and the progress bar stop increasing...

i don't konw why... thanks

Hi wenliang,

Try the following code:

it looks like a very simple question.

why make me so ...

thanks ,everybody .