c# - Appending Contents of two RichTextbox as a single RichText string

Question

I want to append the contents of two rich text boxes in a Windows Forms .Net application; say: stringText = richtextbox1.Rtf + richtextbox2.Rtf; The stringText should be RTF text, which should have tf line once, having concatenated rich text.

The Clipboard is not in scope here.

Also, I'm curious, if we can de-merge them.

Answer 1

Try this:

richTextBoxTarget.Select(richTextBoxTarget.TextLength, 0);
richTextBoxTarget.SelectedRtf = richTextBoxSource.Rtf;

This merges the contents of richTextBoxSource to the end of richTextBoxTarget. It automatically creates valid RTF with only one tf tag.
To de-merge, also use Selectand SelectedRtf. The only requirement here is, that you need to know, at what position you want to split.