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Which control to display text to be programmatically edited later on

I am currently developing a chat application in C# and I would like to know which form control allows to add text retaining control to each specific message to modify it later on when is required. I want this in order to be able to add a double tick when the message is received in the other side of the communication, pretty much like in "Whatsapp".
I've thought about an approach consisting on each message object firing events (like "sent", "received"..) when it changes that are listened by the corresponding form control that serves as the view, adding the above mentioned tick.
Any advice on how to achieve this goal? I've tried TextBox but Lines property force to have control os indexes and I want it to be completely event driven. Currently I stuck with DataGridView, however I've made little to no progress.
Thanks!

No one ready made Control I can think of will do the job, I'm afraid.
I would use a FlowLayoutPanel and add a Label for each chunk of text that gets added to the chat.
You can use MeasureString with a given width to get the height of the Label. (AutoSize should be off.)
The Labels would get the Width of the FLP and you could keep a List<> of the Labels with maybe a few meta data, like user, time etc..
Sounds like a good candidate for a ChatDisplay class to bundle the whole functionality!
Of course as the Labels are Controls you can add events to them as you like to communicate with the ChatDisplay or even with an outside communications object.. And the ChatDisplay class is free to implement whatever you need anyway. If necessary you can wrap the Labels in a ChatItem class, too.
Much more extensible than digging into a DGV to force it into doing things it was not meant to do..

Add label to textbox custom usercontrol in WinForm

I am writing a windows forms application that has a lot of textboxes. I want to add a label or a caption to the textbox, so that I don’t have to drag a lot labels onto the form and deal with positioning etc. So far I have found 2 possible ways to do this.
Create a user control with the label and textbox. How do I get the
control, label and textbox to size appropriately depending on the
text entered since the control will be reusable and different text sizes will be entered. How to get all the
properties and events of the textbox to remain the same.
Extend a normal textbox and add a string property called label or
caption, and show this property at the left of the textbox. I know
this can be done in Web.UI with CSS but is it possible in a winform
and how?
Any suggestions on how to do either of these?
Thanks.

You can create a UserControl that contains a label and a textbox. When you add the user control to your form, both the label and the textbox within will be added simultaneously. You can expose properties of the label and textbox to assign values at design or run time.
Using this method, you can add multiples of the user control to standardize the layout. As far as resizing the controls based on the text, you'll have to subscribe to events and change the sizing manually.
For example, you can subscribe to the TextChanged event of the label and the textbox. When the event fires, you calculate the size of the string and then adjust the width and position of the controls accordingly.

If you get to the point where you have too many textboxes, I would suggest switching to a DataGridView. The GridView component is very well suited for what you're describing, but of course it requires you to accept a grid layout.
One of the bonuses involved in using a GridView is hard to appreciate until you see it in action: it creates only one HWINDOW at a time (two if you're in editing mode). If you create Labels and TextBoxes all over your form, each one is registered with the operating system as an HWINDOW object. All those HWINDOW objects take time to display! In .NET 1.0, WinForms was so slow that dialogs with more than about two dozen controls were unusable. Even though .NET 2.0 is much better in this regard, but you'll still get significantly better performance by using a single control that manages lots of data, as opposed to lots of controls that each manage one piece of data.
Oh, and another option, if you like: you can also try a PropertyGrid. It has the advantage that it will also show help and allow you to create complex editing controls for each element.

richtextbox, embedding custom object

I have a customized class which holds every move in chess and I want to write down every move to a richtextbox. So I am going to overload the tostring() of that custom class and use some formatting to add it to the rtf property of richtextbox. I need to find out which object is clicked so that I can set the game board accordingly. I don't know how to detect which object is clicked inside the richtextbox. Probabely I can use LinkClicked event of the richtextbox by introducing every object as a link to richtextbox. Any ideas??

Not a direct answer of your question - but using a ListBox, ListView, or other list control is not only much simpler, but will do everything you are asking and more (it's what they were designed for).

How to draw text at runtime

Basically, Im making a paint application very similar to MSPaint.
The idea is that, that the the user clicks anywhere on the form and should be able to write text in a control. And then following that, that text should be displayed in g.drawstring graphic method.

I don't want to do the whole thing for you, but here is a basic outline of one way to accomplish the goals you outline. This is not necessarily the best way, but it should get you started and will introduce you to a number of WinForms concepts.
Writing the text
Create a Form and add a TextBox control to it. Make sure it is hidden by default. Override the OnMouseClick method of your Form and add code that checks if the TextBox is visible and if not, shows it and puts focus to it for the user to enter their text. If the TextBox is already visible, the code should hide it and create a new UserControl in its place that shows the text (see below for details of that UserControl).
Also add an event handler to the TextBox so that if the user hits Esc, it cancels the edit and if they hit Enter, the text is accepted and the UserControl is created.
Displaying the text
Create a UserControl and make sure that the UserPaint and Opaque styles are set in its construction (see SetStyle - you may also want to consider OptimizedDoubleBuffer and AllPaintingInWmPaint as this can reduce flickering though it does require extra paint code).
Override the OnPaint method in your UserControl and implement the code for drawing the string (remember, you'll also need a way to set the text on the control).
Conclusion
If you hook all that up, you should have something that appears to meet your requirements. For further experimentation, consider how you could remove the need for the UserControl. Good luck and have fun!

C# Adding style to a control

I have a Panel and I am adding controls inside this panel. But there is a specific control that I would like to float. How would I go about doing that?
pnlOverheadDetails is the panel name
pnlOverheadDetails.Controls.Add(lnkCalcOverhead);
The control named lnkCalcOverhead is the control I'd like to float.
Thanks in advance
EDIT: By float I meant the css style not anything fancy :)

If you have a CSS class defined for the control, you could do this before calling the Controls.Add method:
lnkCalcOverhead.CssClass = "MyClass";
If you want to use the style attribute directly, try this:
lnkCalcOverhead.Style.Add("float", "left");

IF you are talking about System.Windows.Forms here (and not WPF or ASP.NET):
When you are talking about float, do you mean you want to position it anywhere you want by code? If so, just set the .Location property of the control.
If you are talking about letting a control be moved around inside the panel by the user of your program, you will have to code that. That means capturing mouse events and moving the control accordingly?
Alternatively you can instead of letting the control reside within the Panel, make it as a single control occupying a new form (hence you dont have to code all the mouse event handling). Just make sure that the window is limited to be moved within the boundaries of the "parent panel" (just check on the move event of the form if its within the boundariesm and force it to stay inside).