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Obviously, it was a bad idea to post the question here so I have deleted my posts. It was wrong of me to find sample code on a forum, spend 15 hours trying to modify it to suit my needs and then when I got stuck ask for help here. In my opionion, the ComboBox lacks basic features and I have found several other posts on other forums where programmers are asking how to solve the problems with the lack of tooltip and enable/disable features. I have virtually no experience with the Windows API and was hoping that by posting questions here, a little joint development could solve these problems once for all. However, I realize I was wrong and I will never have such thoughts again.
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What you were wrong about was that assumption that other people should write all the code for you. People here are not paid to give help, and do it out of pure kindness. If you want that help you need to show them some respect.
People here are generally happy to answer questions, but will rarely actually write more than a line or two of example code. What you were asking for was for someone else to do all the code for you.
How can you expect to write components like you describe if you have "virtually no experience with the Windows API" the first thing you should do is learn about the Windows API (Or winforms or WPF or whatever you choose to do it in).
You basically have three options:
1) Make the modifications yourself. You will need to learn the appropriate technology. If you get stuck, ask specific questions, and people here will give suggestions and guidance or point you towards articles or books that will help you. What they won't do is write the code for you.
2) Pay someone professional to make the modifications for you. www.rentacoder.com[^] might be a good place to start looking.
3) Find an existing component that meets your requirements out of the box. There are plenty of commercial companies that make .net components Telerik[^], DevExpress[^], Infragistics[^] etc, and if you google about a bit, there are also lots of open source projects.
Simon
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Thanks for your post.
Simon Stevens wrote: What you were wrong about was that assumption that other people should write all the code for you.
The code was at least 90% finished and I had spent 15 hours on it. I did not assume other people would write all the code for me.
Simon Stevens wrote: If you want that help you need to show them some respect.
????? Are you implying I was disrespectful in any way in my post???
Simon Stevens wrote: What you were asking for was for someone else to do all the code for you.
The code was at least 90% finished and I had spent 15 hours on it. I have a feeling solving two of the three issue listed would require about 3-4 lines of code each.
Simon Stevens wrote: How can you expect to write components like you describe if you have "virtually no experience with the Windows API"
By finding example code on the Internet and asking questions on forums. I have done some pretty advanced stuff in C++, VB, LabVIEW and Matlab without having experience in those areas.
Simon Stevens wrote: If you get stuck, ask specific questions
I provided a list of three issues. I agree that one of the issues might have been a little involved, but the other two issues were very specific.
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Well, it was mainly the asumption that as you ha spent 15 hours on it other people would also want to spend their free time too. You may have asked for help on 3 specific issues, but you posted loads of code that had to be read through.
arnold_w wrote: I have a feeling solving two of the three issue listed would require about 3-4 lines of code each.
In which case, why not write them?
arnold_w wrote: By finding example code on the Internet and asking questions on forums. I have done some pretty advanced stuff in C++, VB, LabVIEW and Matlab without having experience in those areas.
I beg to differ. Without a good understanding or experience of a language how do you know it was 'pretty advanced stuff' - to an expert it was maybe 'bread and butter' code. Who knows - or cares, come to that.
As Simon said, everyone here on CP gives up their time freely to help guide people, but are reluctant to spend ages reading reams of code or write more than a few lines of example code.
Bob
Ashfield Consultants Ltd
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Having a combobox with disabled items is pointless and contrary to the intended use of the control. What *I* would do is allow the user t select whatever he wanted in the control, and then enable/disable other form controls if the selected item is "disabled".
When you get right down to it, allowing them to even SEE a disabled item is pointless. If they're not allowed to select it, don't include it in the data.
"Why don't you tie a kerosene-soaked rag around your ankles so the ants won't climb up and eat your candy ass..." - Dale Earnhardt, 1997
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"...the staggering layers of obscenity in your statement make it a work of art on so many levels." - Jason Jystad, 10/26/2001
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Thank you for giving me your perspective on this matter.
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I tend to disagree. I'd much rather have optional items disabled as appropriate than have them appear/disappear seemingly at random. Best ofc would be to add a tooltip explaining what would reenable them. Not sure if that's doable with a combobox.
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When I click the button on the winform to populate teh listbox with data, the form freezes and therfore do not see the listbox when data is being added to it.
When the population is done, only then the form is NOT frozen any longer and then I can see the data inside the listbox.
Is this to do with threads?
How do I solve this so that I can see the data as they are being added to the listbox?
Thanks
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Yep, the populating is done in the GUI thread. The easiest way to solve this is by using a BackgroundWorker. Put the code for the population in the DoWork event of the BackgroundWorker and just start the BackgroundWorker when clicking the button.
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You can't do this.
winforms controls can only be updated from the GUI thread.
Either do the processing on a background thread, and call to the GUI thread to update in batches, or do what Ashfield says and do all the processing before you update the listbox.
Simon
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arkiboys wrote: Is this to do with threads?
Yes, your UI thread is tied up with populating your listbox
arkiboys wrote: How do I solve this so that I can see the data as they are being added to the listbox?
It doesn't make sense to do this really, the user cannot access the listbox until its fully populated so why show them it partially done? To keep the form responsive you could use a background thread to populate a collection of some type (say a datatable) and then just bind this to your listbox, but the user will not see the listbox contents until they are fully populated.
Bob
Ashfield Consultants Ltd
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The job takes aboout 4 hours to complete.
Data gets added to the listbox and so I would like the user to see what is being added...
Is there a way so that the user sees the listbox being populated?
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arkiboys wrote: Is this to do with threads?
Kind of.
You are obviously doing a lot of stuff in the button click event handler.
A standard winforms app has a GUI thread which does all the form drawing and event processing. When you click the button, that thread triggers the event handler. If you then do a lot of time consuming work in the event handler, the GUI thread is tied up so can't do any other work, like redrawing the list box or processing other button clicks. What you need to do is do any long running tasks on a background thread. The easiest way to do this is with a BackgroundWorker[^]
One of the quirks of winforms is that only the GUI thread can actually update any controls. This means that you will need to do your complex calculations on the background thread, but switch back to the GUI thread to add the items to the list box. You use the Invoke method on the form to call code on the GUI thread.
if(this.InvokeRequired)
{
dosomethingdelegate dsd = new dosomethingdelegate(dosomethingmethod);
this.Invoke(dsd, anyParametersGoHere);
}
To do this, I would group them up into blocks, do the processing on the background thread, then call a method to add several at a time using the ListBox.Items.AddRange method on the GUI thread. This will also reduce the number of repaints of the list box that the app needs to do, so will improve it's performance.
Simon
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Simon Stevens wrote: this.Invoke(dsd, anyParametersGoHere);
I'd go with BeginInvoke as it returns immediately without waiting the control to be updated. BeginInvoke is safe unless you pass reference parameters to the method which updates the control.
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how fill gridview from datatable or how set conntent of datatble on the gridview Web C#
zz
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Datasource and databinding. Ever heard of the HELP facility in visual studio?
Bob
Ashfield Consultants Ltd
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Hi friend can any body tell me about .pfx file. and why we need ti use it in project and what is it advantages.
wasim khan
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Why didn't you use Google for this question? Seriously, why? It's taken you longer to ask this question than it would have taken for you to google pfx file. It's a personal information exchange key, and contains a public and private key. One place you need this file is in ClickOnce.
Seriously though - Google it and read up on it. It does so much more.
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Hi,
everybody how can merge three liste Of int in csharp.
Exemple:
List<int> Audios;
List<int> Videos;
List<int> Books;
list<int> All;
the list ALL must contains the merge of the three list, the question is can we do with out using foreach statment for the thre list.
thankx
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you can use the AddRange method to add the whole of one list's contents to another.
List<int> Audios = new List<int>();
List<int> Videos = new List<int>();
List<int> Books = new List<int>();
List<int> All = new List<int>();
All.AddRange(Audios);
All.AddRange(Videos);
All.AddRange(Books);
Simon
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papy-boom wrote: the list ALL must contains the merge of the three list, the question is can we do with out using foreach statment for the thre list.
Well, you can call methods that does it for you, but there is no way to merge entire lists. The items has to be added one at a time whichever method you use.
The most efficient way is to create a list with a specific capacity, that way it doesn't have to be resized while the items are added:
List<int> all = new List<int>(audios.Count + videos.Count + books.Count);
all.AddRange(audios);
all.AddRange(videos);
all.AddRange(books);
Despite everything, the person most likely to be fooling you next is yourself.
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Hi All
I’m trying to make a list view to catch multithreads. I have a tree view on the right and the list view at the bottom. i want to find out how to display what has been open in the MDI. E.g. if I open a form called email using the treeview I it should display the details that I opened the email form in the list view. It is something like Microsoft Dynamics SL -Solomon
I am very new at c#
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Do you mean you do something on the form (or the TreeView), and then some backend processing happens in a thread and when the results come the ListView gets updated? If so, use BackgroundWorker helper class in the System.ComponentModel namespace.
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It's code that drives you - Shyam
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