Add text to rich text box

Question

1.00/5 (1 vote)

See more:

how to add text to rich text box in c# without canceling all the formatting of the text.
because, .text functions returns new string that contain only text.
Thanks

What I have tried:

all the .text functions and google

Posted 5-Feb-23 1:17am

Member 10631275

Updated 5-Feb-23 11:18am

Add a Solution

Comments

Member 15627495 5-Feb-23 7:50am

use concatenation of String :

RichTextBox.text += text_to_add ;

look at : https://learn.microsoft.com/en-us/dotnet/csharp/how-to/concatenate-multiple-strings

Dave Kreskowiak 5-Feb-23 9:32am

You didn't read the question, did you? Appending to the Text property does not work in this case.

Member 15627495 5-Feb-23 9:42am

the origin of the text involved matters too.
What is the origin of the new text ? a web page ?
Is the new content 'reliable' for the aim requested ?

depending the source text, holding the text format could be impossible

Dave Kreskowiak 5-Feb-23 12:56pm

The "source" of the text does not matter.

Member 10631275 5-Feb-23 16:11pm

it's only text with back color and some size.

3 solutions

Solution 1

Use the RichTextBox.AppendText method:

C#

MyRichTextBox.AppendText("Hello world\n");

Posted 5-Feb-23 3:01am

OriginalGriff

Solution 2

thanks but i need to add and change txt in the middle not the end...

Posted 5-Feb-23 6:29am

Member 10631275

Comments

Dave Kreskowiak 5-Feb-23 12:54pm

First, you posted this as an answer to your own question. If you need to reply to a post, click the "Have a question or Comment" button under the answer you want to reply to. That way, the person gets an email that says you replied to them.

Next, which type of app are you writing? Windows Forms, WPF, ASP.NET WebForms, MVC?, ...

Member 10631275 5-Feb-23 16:08pm

thanks
windows form

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

Member 10631275 · Accepted Answer · 2023-02-05T11:18:00

Solution 3

ok, What worked for me was is richTextBox1.SelectedText+="what you need to add"; it's tricky but it's work.

Posted 5-Feb-23 11:18am

Member 10631275