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Thanks for the sample #realJSOP. Actually I don't need to save the exact moment the form is closed. This form is used to give the user the possibility to change the time and/or the date of the device (Windows CE based) on which the app is running and it is not used to change a variable used somewere else in the app. So I declared an external static class and in this class I declared my form instance: public static class Cl_Forms { public static FormDateTime Suc3 = new FormDateTime(); } As you suggest, in this way the form shown in a modal way should be static and should not be disposed until the app is running. Now I'm testing this solution. Unfortunately the exception occurred rarely and randomly and it was not easy to reproduce it.

Thank you very much k5054 for your explanation! :thumbsup:

Thanks Eddy! That's what I needed! Unfortunately I had not found that article...

Thanks very much Dave, this is the help I needed. I solved the problem. ...and yes, you're right, I miss some Dispose, but this was just a short and fast sample to show my problem. Anyhow I recognize that my code is not good code... Thanks

You've tried to help me, I can only thank you even if I have not solved the problem!! ...and now I've learned one more thing! I don't think that the problem is at the other end of the connection, ie at the PLC, for two reasons: 1- I have disconnected the cable so the PLC can do nothing; 2- there is another touch panel connected to the PLC, a standard HMI, and it works fine with disconnections and re-connections so the PLC seems to behave in the right way.

Thank you Matt. The link you suggest is a good starting point. Compact Framework is limited compared to the full .NET framework but the article Detecting user activity/inactivity in a Windows Mobile app[^] seems to be promising. Thanks for pointing me in the right direction. Steve

Hi, it seems that this topic is not very interesting but I've found the solution and I want to share it. I contacted OpenNETCF support and Chris Tacke answered very kindly. The solution is to remove from project references System.Xml.Linq that for some reason sometimes generates this kind of problem in VB.NET CF 3.5 projects.

Thank you. I'm not sure I understood well what you mean. I try to explain in more detail what I do. In a form, call it FormA, I have four TextBox and in the Load event of the form I assign a delegate to the GotFocus event of the TextBoxes: AddHandler (AutoIncTB.GotFocus), AddressOf FormMain.TB\_GotFocus\_1\_MAX\_RIP AddHandler (RipTB.GotFocus), AddressOf FormMain.TB\_GotFocus\_1\_MAX\_RIP AddHandler (DuratFinaleHTB.GotFocus), AddressOf FormMain.TB\_GotFocus\_0\_23 AddHandler (DuratFinaleMTB.GotFocus), AddressOf FormMain.TB\_GotFocus\_0\_59 In FormMain there are some functions TB_GotFocus_XXXX that assign different values to some variables and then show the NumericPad. Public Sub TB_GotFocus_0_23(ByVal sender As System.Object, ByVal e As System.EventArgs) CGlobali.ValoreCambiato = False Ctrl(0) = sender Ctrl(1) = 0 Ctrl(2) = 23 PhBt.Focus() Tastiera.ShowDialog() 'NumericPad End Sub The NumericPad "reads" the variables and understands what is the TextBox from which it was called and other things. Using the NumericPad I can write in the TextBox. Each TextBox has its own TextChanged event that is fired any time I write a digit, not when I push the OK button unless I write something also with the OK button (and this is what I do in this moment... but I could also use a flag... mmmm....). You talk about textbox OK, did you mean the TextChanged event? I hope this can explain better what I'm doing.

Hi Eddy, thanks for your efforts. I add the second label but no label takes the right content in the form; in the debug the Text properties contain my string and the "Hello world" string. I also call the Refresh method of labels and form but nothing changes. Before I did another project where I used the SerialPort object of .NET, everything was in the form1 and I used the DataReceived event of the COM to write in the textbox the received data, always using the Invoke method, and everything was OK. In this project I don't use the SerialPort object but the API in coredll.dll (CreateFileW, ReadFile, SetCommMask, etc.) because I need to catch different information from the COM port and all this is in a separate class/file. This is the main difference between the two projecs, in addition to the fact that one works and the other not... Sorry but I really don't know what is THE fundamental information I'm missing to solve this problem, if you have any questions, please feel free to ask.

Yes, I tried to use the ErrorReceived event but it doesn't seem to work. I use the DataReceived event to receive data and it works but I get no error, on the other hand I read in the help that: ... PinChanged, DataReceived, and ErrorReceived events may be called out of order, and there may be a slight delay between when the underlying stream reports the error and when code can when the event handler is executed. Only one event handler can execute at a time. ... However, I found another way using API and p/invoke: I use the function WaitCommEvent() to get directly the break instaed of the framing error. This solution was suggested by Bruce Eitman in the MSDN Windows Embedded Compact forum and I found a good example in the article "Smart Device Print Engine for Compact Framework" by Orkun GEDiK here in CodeProject. Thanks anyway for your interest and for your time.

Thanks Marco, the overflow error is not a big problem, I mean that it seems to be "automatically" managed: I didn't noticed it until I tried to catch errors and the reception was ok, i got all the bytes I expected. DMX is a serial communication at 250000 baud, I can't (and I don't need) to modify the baud rate. What I need to do is to catch the framing error that I'm sure occurs because the DMX data packet starts with a BREAK that lasts at least 88 µs and during which the line is low (zero).

Yes it is... I have solved the problem enabling the timer from a sub in the main thread and colling this sub with the Invoke function from the web server thread. Bye!

Nice, you're welcome :)

Thank you halabella for your answer. It can be a possibility but in this way I think you lose the behavior of the button (button pressed - button not pressed). In my particular case I could just use an image because the text I need to write is a symbol of a font type not included in my Windows CE (for this reason I need to put an image in a button) but there would be much difference aesthetically with the other buttons of the form. ...but perhaps I could change the image on the click event... yes, it is a possibility. Thanks :thumbsup:

Yes, you're right, the value was converted to the integer type. BitConverter works. Thank you.

You're welcome :)

Hello Steve, I came across the WM_NOTIFY message and (inter?) windows messaging in the REBAR control (ribbon/taskbar) manipulation code sample on the microsoft website which also provided me with a sample implementation that i found understandable, during the time when i was learning microsoft VB5 CCE.

steve_9496613 wrote: ...and that was the problem: I put a NumericUpDown control in a UserControl and I give it an unique name (NUD1). When, at runtime, I create 10 instances of the UserControl, what are the unique names of the 10 NumericUpDown controls originated from NUD1? Good assesment; the others wouldn't have a name. steve_9496613 wrote: also this property has a unique name... until the UserControl is one, but when I create 10 instances of the UserControl? You'd have 10 controls without a name (the usercontrol), but with a known property that points to the correct control. steve_9496613 wrote: Well... it works... although I have some difficulty in evaluate the elegance of this code... What do you think about this solution? It'll do; seen the technique before, usually when ex-VB programmers want an "array" of controls. It adds a single pointer to the list for each control, so it's not very resource-intensive. Bastard Programmer from Hell :suss: If you can't read my code, try converting it here[^] They hate us for our freedom![^]