How do I send varying text sized strings from one RichTextBox to another?

Question

I have code that has chemical compounds that have small font for the subscript. I currently have this code that transfers it from one RichTextBox to another one on

Answer 1

To copy text including formatting you should use the usual RTB way:

• Make a Selection and then act on it!

This is the way to go, no matter what you do:

• Style your text with SelectionFont, SelectionColor, SelectionAlignment etc..
• Insert or remove text with Cut, Copy or Paste
• Find text or AppendText

Here is how to do what you asked about:

otherRichTextBox.SelectionStart = 0;
otherRichTextBox.SelectionLength = otherRichTextBox.Text.Length;
myRichTextBox.AppendText(otherRichTextBox.SelectedText);

To insert the portion of text at position n you write

otherRichTextBox.SelectionStart = 0;
otherRichTextBox.SelectionLength = otherRichTextBox.Text.Length;
myRichTextBox.SelectionStart = n;
myRichTextBox.SelectionLength  = 0;
myRichTextBox.SelectedText = otherRichTextBox.SelectedText;

You need to go by the rule anytime you want to change formatted text in pretty much any way!

A little bit involved but guaranteed to work correctly as it goes by the book.

To simply 'clone' the full text, go by Grant's code:

myRichTextBox.Rtf = otherRichTextBox.Rtf;

It is possible to work with the raw Rtf codes, if you know what you are doing, but even if some things may still look ok for a while because some errors and most redundancies get ignored, it has a tendency to collect crap.. So you should follow the golden rule:

• Make a Selection and then act on it!

Update: Here is a nice way to solve your problem correctly with only two lines! (But you still need to live by the rule..)