Téléchargement d'un document a partir d'une bibliothèque SharePoint

SPFile filedownload = SPContext.Current.Web.GetFile(chemin complet du fichier);

byte[] fileByte = filedownload.OpenBinary();

Response.Clear();

Response.AddHeader("Content-Disposition", "attachment;filename=" + filedownload.Name);

Response.ContentType = "application/pdf";

Response.BinaryWrite(fileByte);

Response.Flush();

Response.End();