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PDF Clown - zde potrebuji pomoct rozchodit kod

Koukam uz nakou hodku do samples a zasekavam se tady:

                // Document metadata.
                #region metadata
                File file = new File();
                Document document = file.Document;
 Information info = new Information(document);
                document.Information = info;
                textBox2.Text += "\r\nAuthor\t\t:\t\t" + info.Author;
                textBox2.Text += "\r\nCreation Date\t\t:\t\t" + info.CreationDate;
                textBox2.Text += "\r\nCreator\t\t:\t\t" + info.Creator;
                textBox2.Text += "\r\nTitle\t\t:\t\t" + info.Title;
                textBox2.Text += "\r\nSubject\t\t:\t\t" + info.Subject;
                #endregion metadata

problem je na radku s File file = new File();

VS 2008 hlasi:
error CS0246: The type or namespace name 'File' could not be found (are you missing a using directive or an assembly reference?)

pritom koukam do samples prikladu a tam jmenne prostory mam vsechny a dllka na assembly byla dodana jen jedna a tu samozrejme u projektu mam.

pokud zkusim:

                Document document = fileName;

mam problem s:
error CS0029: Cannot implicitly convert type 'string' to 'it.stefanochizzolini.clown.documents.Document'


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