Update Items containing HTML Code with C#

Question

Hi everyone,

I'm currently working on a C# API for MOSS.
My task is to create a tool, that copies values of existing items from one list to another.
Works fine, as long as the copied value doesn't contain any HTML Code.
If the value contains HTML Code, the item history increases but the field where the new value should be, stays empty.
(e.g.: copying "Hello World" is no problem.....but "<ul><li> Hello </li> <li> World </li> </ul>" doesn't work.)
Anyone who could help me out of this?

Regards,
Simon.