Simple Threading (VS 2005) Example

[WinSolution]

Dear All I want a simple threading example in VS 2005 C#. When i run the project it should display a label with yellow background and increases it width 1px witn 1000ms interval. I have googled it out but they are using delegates & some are using timer but i dont want to use both. Any kind of help will be appreciated. Thanks.

[J a a n s]

I don't think that you can do this without the help of delegates. You wont be able to modify a control created in one thread from another. Check the following links: Invoke Required[^] http://msdn.microsoft.com/en-us/library/ms171728(VS.80).aspx[^]

WinSolution wrote:

I want a simple threading example in VS 2005 C#

You have to that do it yourself. If you are finding any issues post it here and we can help with it.

[prasadbuddhika]

this can be done without using a delegate if you are doing the label updating through the thread where the label is created(means in the main form thread). if you use another thread to increase the value and the label is in the main thread you have to use the delegate. because cross thread operations are not allowed .

[WinSolution]

Yes i have tried and i found Cross Thread Error thats why i tried here if there is any way. Basically i have shifted from Java to CSharp as i am working with C# last 8 months but i haven't learnt some new concept of c#. I was good in Java's Threading as wished if there is another way. Thanks.

[WinSolution]

Following is the code which i tried but got error of Cross Thread. public partial class Form1 : Form { public Form1() { InitializeComponent(); } private void Form1_Load(object sender, EventArgs e) { ThreadStart ts = new ThreadStart(ProgressBar); Thread th = new Thread(ts); th.Start(); } public void ProgressBar() { label1.Width += 1; Thread.Sleep(1000); } } Please share if you can figure out the problem

[ABitSmart]

Reiterating what everyone has already mentioned. You cannot change UI state from a *non-UI* thread. ProgressBar is running on a non-UI thread. Use, BeginInvoke. Read the links already shared to you or see here[^]

[Cracked Down]

Use Control.Invoke method to update controls on main thread.........

[Luc Pattyn]

Hi, if all you want the thread to do is move a Label, then you don't need a thread at all. Just use a Windows.Forms.Timer, that is a timer that ticks on the GUI thread, hence you can have the Tick handler manipulate Controls without any InvokeRequired/Invoke (as long as it is fast, otherwise your GUI would freeze). :)

Luc Pattyn [Forum Guidelines] [My Articles]

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modified on Sunday, June 12, 2011 8:37 AM