Add entry to RichTextBox?

Question

WPF

FlowDocument document = new FlowDocument();
                                                    Paragraph paragraph = new Paragraph();
                                                    paragraph.Inlines.Add(new Bold(new Run(connetn)));
                                                    document.Blocks.Add(paragraph);
                                                    richTextBox.Document =document;

This is how I add a record, but it overwrites the previous ones, but I need it to add a record already to the existing ones.
Example
I pressed the button, added the number 1, pressed it a second time, added 2 to the first entry.

Answer 1

You have a document every time a new one is created, work with the old one.

Paragraph paragraph = new Paragraph();
                                                    paragraph.Inlines.Add(new Bold(new Run(connetn)));
                                                    richTextBox.Document.Blocks.Add(paragraph);