How do I update a control from another thread?

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- 29 Oct 2004 20:21 GMT

Hello all,
I have read a lot about that I can't do something like

TextBox1.text ="abc"

if I am not in the gui thread. Can someone explain what
I actually need to do?

Tia

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Herfried K. Wagner [MVP] - 29 Oct 2004 20:30 GMT

<guy> schrieb:

> I have read a lot about that I can't do something like
>
> TextBox1.text ="abc"
>
> if I am not in the gui thread. Can someone explain what
> I actually need to do?

Always show your forms in the app's main UI thread and use 'Control.Invoke'
to communicate in the thread -> UI direction:

Multithreading:

<URL:http://msdn.microsoft.com/library/en-us/dnforms/html/winforms06112002.asp>
<URL:http://msdn.microsoft.com/library/en-us/dnforms/html/winforms08162002.asp>
<URL:http://msdn.microsoft.com/library/en-us/dnforms/html/winforms01232003.asp>

<URL:http://www.devx.com/dotnet/Article/11358/>

<URL:http://msdn.microsoft.com/library/en-us/cpref/html/frlrfSystemWindowsFormsContro
lClassInvokeTopic.asp>

Multithreading in Visual Basic .NET (Visual Basic Language Concepts)
<URL:http://msdn.microsoft.com/library/en-us/vbcn7/html/vaconthreadinginvisualbasic.asp>

Sample:

<URL:http://dotnet.mvps.org/dotnet/samples/filesystem/downloads/FileSystemEnumerator.zip>

If you have any further questions, feel free to ask them.

Signature

Herfried K. Wagner [MVP]
<URL:http://dotnet.mvps.org/

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- 29 Oct 2004 23:37 GMT

These examples are rather complicated. I will have to spend
a whole day just to understand how to calculate pi and this
misses the point. O.k. Can you please explain as breifly as
possible what I need to do (and why) in order to update
a textbox from a worker thread.

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How do I update a control from another thread?

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