Umbraco 4.5.2

I'm creating a document using c#. The document is created and I can view it in the CMS. The problem is that I have a checklist in my usercontrol that I'm trying to save into a Checklist Datatype. Doesn't seem to want to take the values.

Is this possible?

Below is the code that I use to create the currentVideo.WordsToDescribeVideo. Benath that is the code that I use to input it into the document.

                    foreach (ListItem li in cblWords.Items)
                    {
                        if (li.Selected)
                        {
                            if (selectedWords.Length > 0)
                            {
                                selectedWords += ", ";
                            }

                            selectedWords += li.Text;
                        }
                    }            

newDoc.getProperty("checkListName").Value = currentVideo.WordsToDescribeVideo;