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creating ListBoxItems with custom style in wpf

This may seem familiar to you but I have a problem creating a custom List Box with custom style as well. I can only do one of them at the same time... I can't use both. and another thing is that could you tell me how to add the custom listboxitem in c# code so I could easily add it to the program?
what I mean is that for example if you put an image before the text of listboxitem and then give it an style, but all thease must be done for all items.
thanks to all

First, what have you already tried out? Are you expecting SO users do the work for you?
Listbox tag has a ListboxItemTemplate. For that you can implement a DataTemplate has a StaticResource and put whatever you want inside.
Check the documentation on MSDN.
https://msdn.microsoft.com/en-us/library/system.windows.controls.itemscontrol.itemtemplate(v=vs.110).aspx

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..

making listView acting like treeView in winforms

is there any way to make winforms listView showing data like treeView. i mean to make it verticaly oriented and to show columnHeaders one under another and not to put them in horizontal line?
thanx for assistance

Consider using this open-source ObjectListView.
It's a mature control that can show all sorts of lists, a tree-list and much much more (not my code - I'm just a happy user).
It take a few minutes to get used to the idea of using it, but once you got it - using it is a breeze.
Examples:

You can also consider using Better ListView. The usage is 99% same as the original .NET ListView, but it has many extras. For example, every item has a ChildItems property in which you can put further children.

Multi-line list items on WinForms ListBox control?

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.

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