checkbox list to itextsharp list to pdf Field

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C#

itextsharp

Hi All

Basically, I have a checkbox list, and on button click, im asking itextsharp to create a list and put it in the field based on whats checked.
here's what a i have:

using li = System.Web.UI.WebControls.ListItem;
using it = iTextSharp.text;

it.List intList = new it.List(it.List.UNORDERED);
foreach (li li in cblInterior.Items)
{
    if (li.Selected == true)
       {
           intList.Add(li.Text);
                    
       }
}
pdfFormFields.SetField("InteriorText", intList);

but, i get an error at the last line saying: "The best overloaded method match for 'iTextsharp.text.pdf.AcroFields.SetField(string, string)' has some invalid arguments."

But I can't tell what im missing. Doesnt "intList.Add(li.Text)" turn it into a string already? Is it a syntax problem with itextsharp?