There are many Rich Text Editors (RTEs) available for this purpose. Many of them are free for personal use (For commercial use, you may have to buy a license).One of the most popular ones is FCKeditor which you can download and use (free for non-commercial use). Here’s how:

1::Download

Visit http://www.fckeditor.net/download  and download FCKeditor 2.6.4 & FCKeditor.Net / FCKeditor.Java (For .NET / Java).On unzip, you will find an fckeditor folder. Copy it to your own Project Folder and add the reference to the Fckeditor.js file

I.   Add as a control to your .NET Editor

Unzip the FCKeditor.net folder. For adding it to your editor as a control, create a new tab and on choose component add browseFckeditor.Net_2.6.3\bin\Release\2.0\FredCK.FCKeditorV2.dll or you can copy it to a specified folder and set the reference from there.

             Now you can drag and drop the control to your page and play with it!

II. ::You also can do this thing by creating the object of FckEditor

Add these lines to your codes:

<script type=”text/javascript”>

var oFCKeditor = new FCKeditor( ‘FCKeditor1’ ) ;

oFCKeditor.BasePath = sBasePath ;

oFCKeditor.Create() ;

</script>

III. ::Yet another approach to do this is by replacing the TextArea with the FckEditor

Add these lines to your code:

<textarea id=”FckEditor”></textarea>
window.onload = function()

{

var oFckNote = new FCKeditor(‘FckEditor’);

oFckNote.ReplaceTextarea();

}