Export rtf to string

Hello,

probably this will be a really simple and stupid question but nevertheless, I am stuck.

This is what I tried to do: We store rtf in a database and are planning to use Telerik controls in the future (there is a lot of impressive software inside).

Importing the rtf-text to RichTextEditor is quite easy. I simply put the content of the database field into a string variable and import it into RichtextEditore with this code:

This works perfectly.

After editing the text in RichTextEditor I need to export the new text as rtf to a string to store it in the database. I looked over the documentation and found this:

I tried to assign the function's return value to an another string variable:

VisualStudio puts a wiggled blue line under ExportToRtf() and demanded a missing argument for the functions's parameter "document".

Please tell me where my fault is.

Thanks in advance.

P. Arnold