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Inserting graphics into RichTextBox

I have just started studying at an university and came up with an idea to manage my transcripts. It's basically a text editor with a small versioning system wrapped around it.
To avoid ending up with walls of black and white text I had the idea to add some presets for "graphics" (not sure what is the right word to use here). For example, if my professor writes down some kind of definition like this one:
Integral
Also called Riemann integral. the numerical measure of the area
bounded above by the graph of a given function, below by the x -axis, and on .........
I would like to wrap it into some kind of different background and styling, just like here on StackExchange on the quote above, with the press of a button. Another example is in one of my books:
Is it even possible to include such styling into a RichTextBox or should I look for alternatives / existing text editors?

Yeah, implementation Example is given to this URL Stack Overflow Answer
and some code for knowledge purpose
//Apply Some Font to selection
richTextBox1.SelectionFont = new Font("Arial", 16);
// Apply same color of text
richTextBox1.SelectionColor = Color.Purple;
//backgroud colour of Selection
richTextBox1.SelectionBackColor = Color.Red;
One more thing is to clearify, if you want to make a text editor, you have to given combo box for colour, size etc, and change this on IndexChange Event.

C# RichTextBox how to change font ForegroundColor upon printing?

I'm trying to use the RichTextBox (that I've modified a bit with some additions found here and there) so that when I print, my white text becomes black.
To be more precise, I have a RichTextBox with a PrintDocument, PrintPreviewDialog, and so on. I can print without problem with this setup. The only thing is that my application has a dark theme (it is made to be used mainly by night) and the RichTextBox has a black background and the default text is white.
Therefore, when I print (or preview), the white text stays white and it can't be seen when printed...
I would then like to know how I would need to modify my components to change the font color from white to black upon printing. I do not care about other colors (they are the assumed choice of the user) that will be printed fine anyway.
Thanks so much for your pointers on this!

Put this code in your print handler,
var selection = myRichTextBox.Selection;
if (!selection.IsEmpty)
richTextBox1.SelectionColor = Color.Black;

Change text color of existing text

I've written an application that has a richtextbox in it with a black background. Therefore I have to write in it using white text. That all works fine by setting the fore color to white. If I however copy text from Word that is black into my textbox, that text remains black.
I need to change the color of that text. So this is what i've tried so far: (the textbox is named txtMessage)
txtMessage.ForeColor = Color.White;
That doesn't have any effect on the existing black text though.
Then I tried this:
private void txtMessage_TextChanged(object sender, EventArgs e)
{
int s = txtMessage.SelectionStart;
txtMessage.SelectAll();
txtMessage.SelectionColor = Color.White;
txtMessage.Select(s, 0);
}
It in principle works fine but of course every time I edit the text in the textbox (not copying something in there, but simply typing) the whole thing is executed with every letter I type resulting in a flickering ( I guess because all is selected and then deselected every single time).
So does anyone have a suggestion how to fix this elegantly?
Thank you very much.

If you are typing in the box an the colour is set to white, there is no need to run the code.
You only need to run it when you add text that you haven't typed (eg copy/paste from your example).
Therefore, use that code in the TextChanged event, but perform a check before running it as to whether the user has typed the text or added it another way
EDIT: Check the answer to this question: Detecting a paste into a RichTextBox, it might help you

Prevent combobox from resizing on font change

I have a combo box that has a list of font families in it. As you can guess I'm making a toolstrip for editing fonts in a rich text box control. The problem is when I change fonts it's resizing my combobox.
scrolling through different fonts causes the combo box to become "jumpy" and some fonts have a huge height which is causing for some hilarious problems.
Exhibit A:
Exhibit B:
Yeh... I'll show the code that I have so far... by the way the combobox is just bound to the font families collection.
void box_SelectedIndexChanged(object sender, EventArgs e)
{
String text = ((Font)box.SelectedItem).Name;
Font font = (Font)box.SelectedItem;
BeginInvoke(new Action(() => box.Text = text));
BeginInvoke(new Action(() => box.Font = font));
}
Anyone have any ideas, if I can't find a solution I can just stop the font from changing and just display the name in the default font.

Using a ToolStripComboBox is the problem here I think. The .NET 2.0 ToolItem classes have a lot of residual, erm, features that never got addressed. WPF sucked the resources away. The tool strip is obviously not handling the resize very well. Nor does it make the rest of the form move down when it gets bigger which is by design.
The canonical font combobox uses owner draw to display the fonts in the dropdown list in their regular style. Without changing the font of the box itself. You really don't want the toolstrip to resize, that's just not a great UI.

The only way I can think of doing it is by creating a custom combobox control and deriving from said control. This will give you access to the variable ownerdraw which gives us a little more flexibility without having to mess around with the ItemHeight property. Hooking into one of the events, which dictate that the value of the control has changed.
You could then have a function like the following to calculate the new layout size:
using (Font font = new Font(this.Font.FontFamily, (float)this.PreviewFontSize))
{
Size textSize;
textSize = TextRenderer.MeasureText("yY", font);
_itemHeight = textSize.Height + 2;
}

I tried all these approaches with little success sadly. However I didn't realize it until today when I looked at how microsoft office implements it. They actually use the same font in the combo box for the selected item no matter what font is selected. So as much as I want to make it more custom I'm just going to use a uniform font for whatever font is shown in the selected index.

How to add to a textbox the red line (like bad spelling in Word)?

How can we produce the effect of the red line under a bad spelling word like the image below :
alt text http://img505.imageshack.us/img505/7253/options285x395rg9.th.png
Update
I do not want to use Google or whatever spell program. I would like to know how to create the effect of the red line.

You can do this using a RichTextBox control, which will allow you to set the underline style and underline color on any portion of text.
And here's an example doing exactly what you want to do.

use google's spellchecker
http://www.asp101.com/articles/jeremy/googlespell/default.asp

This page shows how to owner-draw a TextBox to draw the wavy red line.

You can use rich edit control's properties and methods to do the drawing of the wavy lines. For more information visit this site: http://geekswithblogs.net/pvidler/archive/2003/10/15/188.aspx