create formatting editor to send a mail

Yes you can take the help of FCKEditor. Here is the code.

Put FCKEdItor in design page.

<FCKeditorV2:FCKeditor ID="FCKeditor1" runat="server" BasePath="~/fckeditor1/">
                 </FCKeditorV2:FCKeditor>

In your code behind you can use this FCKeditor value like this :-

mail.Body = FCKeditor1.Value.ToString();


For all this you have to take the reference of FredCK.FCKeditorV2.dll