fileupload control not returning filename

i have a fileupload control in a formview and it does not seem to be returning a filename


<asp:FormView ID="patientFilesUploadFormView" runat="server"
                     DefaultMode="Insert">
                    <InsertItemTemplate>
                    <div><p>&nbsp;</p></div>
                    <p>
                            <asp:Label ID="l ...