file uploading in grid view

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ASP.NET

hi
i am using grid view edit template for file uploading
i am storing path in database and images in local folder "images"
i write the following code to save image in local folder.

string FileName = Path.GetFileName(FileUpload1.PostedFile.FileName);
                  FileUpload1.SaveAs(Server.MapPath("images/" + FileName));

and code in grid viewis

<asp:TemplateField HeaderText="Image">
                    <ItemTemplate>
                       <asp:Image Width="100px" Height="100px" ImageUrl='<%# Eval("Photo") %>' runat="server" ID="image" />
                     </ItemTemplate>
                    <EditItemTemplate>
                       <asp:FileUpload ID="FileUpload1" runat="server" />
                    </EditItemTemplate>
                </asp:TemplateField>

it is working well when i updating if image is browsed
other wise it shows error


System.IO.DirectoryNotFoundException: Could not find a part of the path 'D:\EmsApp\EmsApp\EmsUI\images\'.

<big><big></big><big>i think that this can be solved by seeting path to image's path 
how can i set this.</big></big>

please any body help me.


thank you