When I Submit Page I Get Error Object Reference Not Set To An Instance Of An Object. Uploaded Link I Declare Correct used that code string filename = Path.GetFileName(Remarkfile.PostedFile.FileName);

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C#

C#4.0

How Get File Name From Below Source Code When I Submit Page I Get Error Object Reference Not Set To An Instance Of An Object. Uploaded Link I Declare Correct used that code string filename = Path.GetFileName(Remarkfile.PostedFile.FileName);

<asp:Panel ID="pnlNew" runat="server" Width="70%" Visible="false" style="padding:10px; border:1px solid #e8e8e8;">
             <table width="100%" border="0" cellspacing="0" cellpadding="4" class="maincontent">
                <tr>
                    <td width="20%">Employee ID</td>
                    <td width="30%">
                        <asp:TextBox ID="txtempid" CssClass="txtbox" runat="server"></asp:TextBox><span style="color:Red">*</span>
                       <asp:RequiredFieldValidator ID="RFVempid"  ControlToValidate="txtempid" ErrorMessage="Country Code" runat="server" Display="None" ValidationGroup="WorkforceRemarks"> </asp:RequiredFieldValidator>
                        <ajax:ValidatorCalloutExtender ID="VCEempid" runat="server" TargetControlID="RFVempid" CssClass="CustomValidatorCalloutStyle" PopupPosition="Right"></ajax:ValidatorCalloutExtender>
                    </td>
                    <td width="20%"> Remark Title</td>
                    <td width="30%">
                        <asp:TextBox ID="txtremarktitle" CssClass="txtbox" Width="80%" runat="server"></asp:TextBox><span style="color:Red">*</span>
                        <asp:RequiredFieldValidator ID="RFVempname" runat="server" ControlToValidate="txtremarktitle" ErrorMessage="WorkforceRemarks Title" Display="None" ValidationGroup="WorkforceRemarks"> </asp:RequiredFieldValidator>
                        <ajax:ValidatorCalloutExtender ID="VCEempname" runat="server" TargetControlID="RFVempname" CssClass="CustomValidatorCalloutStyle" PopupPosition="Right"></ajax:ValidatorCalloutExtender>
                    </td>
                </tr>
                <tr>
                    <td valign="top">Remarks Description</td>
                    <td colspan="3">
                        <asp:TextBox ID="txtRemarksDesc" CssClass="txtbox" TextMode="MultiLine" Rows="5" Width="93%" runat="server"></asp:TextBox><span style="color:Red">*</span>
                        <asp:RequiredFieldValidator ID="RFVDesc" runat="server" ControlToValidate="txtRemarksDesc" ErrorMessage="WorkforceRemarks Description" Display="None" ValidationGroup="WorkforceRemarks"> </asp:RequiredFieldValidator>
                        <ajax:ValidatorCalloutExtender ID="VCEDesc" runat="server" TargetControlID="RFVDesc" CssClass="CustomValidatorCalloutStyle" PopupPosition="Right"></ajax:ValidatorCalloutExtender>
                    </td>
                </tr>
                <tr><td>Upload</td>
                <td>
                <asp:FileUpload ID="Remarkfile" runat="server" />
     <%-- <asp:GridView ID="GridView1" runat="server" HeaderStyle-BackColor="#3AC0F2" HeaderStyle-ForeColor="White"
            RowStyle-BackColor="#A1DCF2" AlternatingRowStyle-BackColor="White" AlternatingRowStyle-ForeColor="#000"
            AutoGenerateColumns="false">
            <Columns>
                <asp:BoundField DataField="Name" HeaderText="File Name" />
                <asp:TemplateField ItemStyle-HorizontalAlign="Center">
                    <ItemTemplate>
                        <asp:LinkButton ID="lnkDownload" runat="server" Text="Download" OnClick="DownloadFile"
                            CommandArgument='<%# Eval("Id") %>'></asp:LinkButton>
                    </ItemTemplate>
                </asp:TemplateField>
            </Columns>
        </asp:GridView>--%>
               </tr>
                 <tr>
                    <td align="center" colspan="4" valign="middle" style="height: 50px;">
                        <asp:Button ID="btnSubmit" CssClass="button" runat="server" Text="Submit" ValidationGroup="WorkforceRemarks" OnClick="btnSubmit_Click" />&nbsp;&nbsp;&nbsp;&nbsp;
                        <asp:Button ID="btnClose" CssClass="button" runat="server" Text="Close" onclick="btnClose_Click" />
                    </td>
                </tr>
            </table>
            </asp:Panel>