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DevExpress RepositoryItemComboBox enter text without showing caret

I am using RepositoryItemComboBox inside a DevExpress.XtraGrid.GridControl. I have very specific requirements for the behavior of the RepositoryItemComboBox. One of these is as follows:
On receiving focus, the combo box should not show caret. It should not highlight (select) the current text.
On keyboard input, the combo box should not show caret, but should update the edit value.
Is it possible to achieve this behavior with RepositoryItemComboBox?

You're probably looking for TextEditStyle = TextEditStyle.DisableTextEditor?

TextBox Text Management

I have a WPF application where I'm trying to create a "diagnostics panel" that's very similar to the "Output Window" in Visual Studio 2010. It simply contains a text box where all types of output are collected and appended in the text box using the .AppendText() method.
We have a couple of customers who leave this diagnostics panel up all the time and never clear it. As a result, a very large amount of text gets displayed as new output continues to come in...
The WPF TextBox has a MaxLength property which I leave set to 0. According to the MSDN documentation, "When this property is set to 0, the maximum length of the text that can be entered in the control is limited only by available memory."
For the customers that leave this panel up, I hate to just let the text and memory grow uncontrolled... I think this may eventually cause the application to hang up...
I am curious if there's a good way to mange this... I want to keep a certain number of lines displayed in the text box and discard the oldest as new lines come in...
Any thoughts?
Thanks!

Why not use a listbox with each sentence getting its own textblock - so you can get virtualization?
http://social.msdn.microsoft.com/Forums/en/wpf/thread/98090161-0abf-4799-bbcb-852dcc0f0608

You could have a DispatcherTimer in your code behind. With this you, you can set it to Tick every 10 minutes (or whatever time period you want). And in the Tick event handler method, you can take the text in your textbox, throw away the all but the amount of text you want to save and then set the that text back to the textbox.
You could also save the text to a log text file. You'd have to figure out what to append to the text file so you won't write the same text to it multiple times. This depends on what exactly your needs are.
DispatcherTimer documenation
Like Xaisoft said, you shouldn't use a TextBox for this, probably a TextBlock instead. You might have to put that inside a ScrollViewer, I don't remember.

Here's how you handle it:
Write the log info to a text file
Write the log info to your text box (although I don't like textboxes, it should be okay.)
When writing to the text box, only display the last maybe 20 or so (play with this) lines. Everything else should "roll off"
If your users really want to save everything, no biggie, it already is saved to that file.
Upon each execution of the app, or at some appropriate interval, roll your logging to a new file.

Prevent the TextBox from getting highlighted

C# WinForms: There is a lot of code playing around SelectionStart, SelectionText, etc properties of a textbox in a program defect I am working on. The thing is that I do not want the text of this text box to get highlighted with those selectionstart, selectionLength, etc methods....Is there a way that I can say turn off selection highlight when we are manipulating the text of a text box with those properties?

Kind of clumsy, but at the end of each of those event handlers you could put focus on some other object. Maybe a textbox that's not visible on the form?

Labels and events!

I have a question? How can I wire up an button in a winform to take an input from a label, and put it in a text box to display the result?
I'm confused!
I have 4 labels... I want to be able to have people put input into the labels click the update button, and then display the results in the textbox below.
Any help? Thank you!

OK so basic outline of what you need to do:
1) Go to the toolbox and put textbox(es) on the form for the user to type in.
2) Add at least one label for your output text
3) Add a Button
4) Select each item on the form, go to its properties (f4) and set the Name property for each one to something that you can remember (this is how you'll reference the controls in your code)
5) Double click on the submit button. This will open up an "Event Handler" for Button.Click, which means the code you write will run when someone clicks the button.
6) Write the C# code to do what you want. For instance, this takes the contents of a textbox (tbInput.Text) and copies it to the label text (lblOutput.Text):
lblOutput.Text = tbInput.Text;
Hope this helps...if not, read the first 3 or 4 chapters of any beginning C# book.

You don't put input input into label, you do that in a TextBox. A label is a as its name implies a "label" (fixed unmodifiable text).

Most simply, create a method to handle the Click event of the button, bind it in.
Inside this method get the text from the labels, and then update the textbox with the input.

.NET standard Labels are not the controls you are looking for. Labels are just that...text labels that do not provide for text input. What you want is a TextBox, which you will be able to find in the Visual Studio Toolbox.
If you want the look and feel of a Label, but the functionality of a TextBox, you can modify the TextBox properties accordingly (border style, background color, etc).
Drop a Button onto your form, and from the Designer if you double-click the button, a _Click event handler will be generated in your source file from which you can implement the code to do whatever it is you want to do.

How to handle multiple instances of input to one field

I want to add a line in a multiline textbox after every information that the user enters in the TextBox in Windows form. I wont be able to determine the point to draw line as I wont know how long the user will enter information. So I am thinking of adding a string "_______" after a button click in the code. Is there a better way?

If the user is going to be required to click a button to confirm a single entry then I don't think you should continue to store the information in the same text box & provide a visual separation with a bunch of dashes, rather move the text entered from the input to a more formatted display (set of controls). Then the display will be separated from input. You could them allow the user to select individual input in the display to modify entry providing a nice user experience.

If you intend to use a regular multiline textbox, printing a line of '-' characters is your best bet. Of course, you could print a line of '─' characters to make the line solid. Another alternative is to use a WebBrowser control, and set its DocumentText property to the HTML you would like to display. This will allow you to append <hr/> whenever you want a dividing line.

You might consider writing a custom control.
You could either paint the control yourself, or use an autosized label and the control's scollbars.