Visual Basic

4-Apr-07 5:26

Hi. Which type of dialog box can I use to show an information message while the code is running behind? The MessageBox stops the execution until the user press ok button.

I have a long process in an application, but can't use a progress bar because the process is called from just one code line that calls a dll method.

Regards,

Diego F.

Kschuler4-Apr-07 6:11

4-Apr-07 6:11

You probably want to research the BackgroundWorker object. It allows you to run code on a new thread.

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Diego F.10-Apr-07 1:33

10-Apr-07 1:33

I'm not sure about how to use that object.

I have a call to a process that takes a long time and I want to show an animated gif while that process is running.

Should I put in the DoWork method the code that takes long time or the code that shows the animated gif?

Regards,

Diego F.

Kschuler10-Apr-07 2:46

10-Apr-07 2:46

You will want to put the code that takes a long time in the DoWork event. However, it's a little tricky because when you run something on a different thread you can't just use class level variables or you will get a cross threading error. Parms have to be passed in through the background worker's argument property. It's too much to explain on the forums but I'm sure there are some articles on using the background worker...

Here is one: http://www.codeproject.com/csharp/backgroundworker.asp[^]

Here is another: http://www.codeproject.com/cs/threads/ImprovedThreading.asp[^]

Hope this helps.

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Diego F.10-Apr-07 4:11

10-Apr-07 4:11

I've been testing with that object. Is there any way to stop the execution until the second thread finish? I need that process to finish to avoid some errors.

Regards,

Diego F.

Kschuler10-Apr-07 4:15

10-Apr-07 4:15

Yes. If you have code that needs to run only AFTER the background worker has finished you put that code in the RunWorkerCompleted event of the background worker control. This event fires once the background worker has completed it's code.

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Diego F.10-Apr-07 4:59

10-Apr-07 4:59

I can't do that, because the code needs access to main thread variables.

Regards,

Diego F.

Combobox again

Jodd4-Apr-07 5:07

Jodd

4-Apr-07 5:07

Now I have the next problem

The combobox is placed on a tabcontrol and a tabpage that is not visible.
The combobox is databound

I set the selectedvalue to a existing value, but after selecting the tabpage the combobox is not set to that item.

If the tabpage is visible then it works fine.

Any suggestions ?

Kschuler4-Apr-07 6:14

4-Apr-07 6:14

Your question doesn't make sense. How can you select a tabpage that isn't visible? Could you please provide more information about what you are doing and how you want the program to work? You may want to check if there is code for loading the tab page which may clear the combobox selection.

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Jodd4-Apr-07 6:28

Jodd

4-Apr-07 6:28

Sorry

The combobox is placed in a usercontrol wich is placed on a tabpage.
By clicking on a button that is placed outside the tabcontrol, al the tabpages have to fill with the correct data. on that moment the first tabpage is visible (selected) tabpage 2 an 3 are not visible

the comboboxes in my usercontrol on tabpage 1 are filled correct, but those on the other tabpages are filled but the item I selected with selectedvalue are not shown

If I reload the form and select the second tabpage before cliking on the same button then the combobox on the second tabpage is ok, but the combobox on the first tabpage not.

I hope this is a better explanation

thx

Kschuler4-Apr-07 7:40

4-Apr-07 7:40

Sometimes I have problems with selecting values from comboboxes when they are set up with a datasource...You could play around with using the SelectedItem, SelectedText or SelectedValue to see if one of those works...
This probably isn't the case, though since you can get it to work if the second tabpage is selected first.

It sounds like it is clearing or reloading when you select a tab page. You could check that event to see if you have some code that is doing it.

Perhaps as a work around you could load the controls for each tab page as they are selected instead of loading them all at once.

I'm sorry I can't help any more than that. I don't have much experience with UserControls and I've only dealt with tab pages in a mobile project. Good luck.

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Jodd4-Apr-07 13:48

Jodd

4-Apr-07 13:48

Thanks

I made the mistake that I put the selectedvalue before loading the data in the combobox, because I have put the code in the property of my custom control that selected the item. Those code was executed before the load instructions.

So by telling that the problem could be the reloading I' ve found the solution

Kschuler5-Apr-07 2:37