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new line is not working [duplicate]

I have some strings that contain line breaks, and I would like to keep this formatting in each ListBox item that the strings are applied to.
Is there any way to do this?
Thanks

The ListBox in winforms doesn't support multiline/text wrapping. If you want that kind of behaviour you probably need to do a custom control or there may be a third party control.
There's a sample implementation at http://www.codeproject.com/articles/2695/an-editable-multi-line-listbox-for-net. It's old so there may be better implementations out there/at least you can see what's involved.

Change the auto-complete behaviour of a textbox

I have two doubts about the autocomplete feature of textboxes in C#.
First, I want to display the full list, not only the ones that start with the given text, and secondly I want to prevent the auto-complete of specific options (some are category titles).
I've been checking the textbox properties and there's nothing related to it, so probably the main question could be, Is there a way to modify / override the textbox events in order to handle the auto-complete actions? (I don't know if it applies to show the full list too)

I assume you're asking about a winforms textbox, as I dont think the WPF textbox supports autocomplete at all.
The base TextBox class will not support doing what you want, so you could in theory attempt to override all of the functionality in the TextBox class to do what you want, but the better idea would be to create a new custom control that inherits from TextBoxBase and implement the autocomplete behavior the way you want it.

I'm not sure about displaying the full list (perhaps a combobox or similar is more suited to this?) but you can definitely do something like this to swap which list of possible items can be displayed.
Another option, though one I like less, is to remove items you don't want to display at a given time from the collection dynamically, like this: textBox.AutoCompleteCustomSource.Remove("ACategoryTitle")
I could foresee that approach having many problems with trying to rebuild the list constantly. I would probably create a subclass of AutoCompleteStringCollection that wraps some LINQ code to nicely select the union of some lists and not others to display in the textbox.

I decided to build my own autocomplete tool with the help of a simple listbox and events, then I could achieve what I was expecting..
The CodingGorilla's answer probably leads to a better solution if you want something more decent, in my case for speed reasons I decided to do it that way but I'll mark his answer as the accepted in order to help other people who have the same doubt and they could consider that point..

Is it possible to highlight certain characters in listbox (c# winform)

I want to write a local search program
when users type chars in the textbox, a listbox should list all the possible results.
For example.
if users type "AB"
then listbox displays possible results like:
"AB"
"ABDDD"
"ADDDB"
i want the charcter 'A' and 'B' to be emphasized, like bold or yellow background
but i can't find the way to give style to certain chars in listbox.
is it possible?
thanx

Yes this is possible in winforms. Its much easier in WPF. To accomplish this in winforms you need to use drawitem event, which is explained here. Additionally, here is an example of using it with a listbox to change the listbox's appearance.
Hope this helps you!

I was able to accomplish exactly what you are looking for in this control: https://advancedlistbox.codeplex.com/. It supports filtering, so you can probably use that to trim the list like you are trying to do.

Custom items in ListView control

I need to add a custom item to ListView control (like on the picture), is it possible ? And if it is, what's the best way to do it ?

I don't know that this is possible with Winforms. The list items in a System.Windows.Forms.ListView are System.Windows.Forms.ListViewItem objects contained in a strongly typed collection.
You could try to create a subclass of ListViewItem, but since that class inherits directly from System.Object and is not an actual windows form control, you might be borrowing trouble, as you would need to replicate all the functionality of the inheritance chain of an actual control.
Now, if you are not too far in to the project, you might consider looking at switching to WPF. The ListView in WPF uses controls as items, so you could easily create a usercontrol that you would use as your list items.
You might be able to find a control library with a control that gives you the functionality you want, but for the most part, the good libraries are commercial and can be prohibitively expensive for small shops and individual .
I did a quick google search for any library that offers this capability, but I could not find one that displayed custom controls.

Not sure if this is what you're after, but ListViewItems have a Tag property that can store custom data about each item.
http://msdn.microsoft.com/en-us/library/system.windows.forms.listviewitem.tag.aspx

How about creating a user control. In that case you can set your user controls at the top and listview below. Or are you trying to add these controls as items in the listview itself?

WPF (irc) chat log control

I'm trying to learn WPF and was thinking about creating a simple IRC client. The most complicated part is to create the chat log. I want it to look more or less like the one in mIRC:
or irssi:
The important parts are that the text should be selectable, lines should wrap and it should be able to handle quite large logs.
The alternatives that I can come up with are:
StackPanel inside a ScrollViewer where each line is a row
ListView, since that seems more suitable for dynamic content/data binding.
Create an own control that does the rendering on its own.
Is there any WPF guru out there that has some ideas on which direction to take and where to start?

I suggest you start with a good object model independent of the UI, and then try a multi-line TextBox or a RichTextBox.
Whether these will suffice will depend on exactly how long you want the log to be able to get. If you run into performance issues, you may need to look at virtualization.

First of all, you should consider if you want to select only entire row (like in a listbox), or if you want to select certain characters from a row (like in a textbox).
In the first case, I think a ListView or even a ListBox should be enough, both of them support virtualization when bound to collection and there should be no problem with huge amounts of data. A stack panel inside a ScrollViewer is a little bit like reinventing the wheel for this case and creating a new control is not a very inspired approach in my opinion (as the functionality you want can be achieved with the existing controls, in WPF).
In the second case, if you want to select some text inside of a line, or if you want word wrapping for your longest lines in the log and want to select individual parts of the wrapped lines, then you need to use a control more oriented on displaying text. Kent already suggested a RichTextBox, I would add AvalonEdit control or even the WebBrowser control in which you directly modify its HTMLDocument.

I would suggest to use RichTextBox too, and store items in a log file or database, if you run into performance issues.
Another solution is to use the WPF WebBrowser control and modifiy its HTML content with:
webBrowser.NavigateToString("<HTML><H2><B>This page comes using String</B><P></P></H2></HTML>");
More information about using WebBrowser control