Problem in Grid view Inline edit ..

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ASP.NET

the gridview markup is as below...In edit mode , the dropdown is not getting automatically selected with the existing data in the cell,

<asp:GridView  ID="gvwMERSFiles" DataKeyNames="Datafile"  runat="server" Width="269px"
                    AutoGenerateColumns = "false" Font-Names = "Arial"
                   Font-Size = "11pt" AlternatingRowStyle-BackColor = "#e4ebf5"
                   HeaderStyle-BackColor = "#67beda" AllowPaging ="false"  ShowFooter = "true"
                    onrowediting="EditMERSFile"
                   onrowupdating="UpdateMERSFile"  onrowcancelingedit="CancelEdit"
                    style="margin-bottom: 0px" OnRowDataBound="gvwMERSFiles_RowDataBound"
                   >
                  <Columns>
                     <asp:TemplateField>
                       <HeaderTemplate>Data File</HeaderTemplate>
                       <ItemTemplate>
                           <asp:Label ID ="lblDataFile" runat="server" Text='<%#Eval("Datafile") %>'></asp:Label>
                       </ItemTemplate>
                      <EditItemTemplate>
                            <asp:DropDownList ID="ddlGrdEditDataFile" runat="server" DataTextField="Datafile"
                                           dataValueField="Datafile">
                               <asp:ListItem Value="0" Text="<--Select-->" />
                           </asp:DropDownList>
                      </EditItemTemplate>
                      <FooterTemplate>
                          <asp:DropDownList ID="ddlGrdFtrDataFile" runat="server">
                               <asp:ListItem Value="0" Text="<--Select-->" />
                           </asp:DropDownList>
                      </FooterTemplate>
                   </asp:TemplateField>
                   </Columns>
                   <Columns>
                      <asp:TemplateField ItemStyle-Width = "30px" >
                          <HeaderTemplate>File Path</HeaderTemplate>
                           <ItemTemplate>
                               <asp:Label ID="lblFileName" MaxLength="30" runat="server" Text='<%# Eval("FilePath") %>'></asp:Label>
                           </ItemTemplate>
                            <EditItemTemplate>
                                <asp:FileUpload ID="fUpldEditFilepath" runat="server" />
                           </EditItemTemplate>
                           <FooterTemplate>
                               <asp:FileUpload ID="fUpldFtrFilepath" runat="server"  />

                           </FooterTemplate>
                       </asp:TemplateField>
                       <asp:TemplateField HeaderText="Action">
                                   <ItemTemplate>
                                       <asp:LinkButton ID="LinkButton1" Text="Edit" CommandName="Edit" runat="server" />
                                       <asp:LinkButton ID="LinkButton2" Text="Delete" CommandName="Delete" runat="server" />
                                   </ItemTemplate>
                                   <EditItemTemplate>
                                       <asp:LinkButton ID="LinkButton3" Text="Update" CommandName="Update" runat="server" />
                                       <asp:LinkButton ID="LinkButton4" Text="Cancel" CommandName="Cancel" runat="server" />
                                   </EditItemTemplate>
                                   <FooterTemplate>
                                       <asp:Button Text="Add" id="btnAdd" runat="server" CommandName="Add" OnClick="AddNewMERSFile" />
                                   </FooterTemplate>
                               </asp:TemplateField>
                       </Columns>
               </asp:GridView>

Code in edit mode

gvwMERSFiles.EditIndex = e.NewEditIndex;
gvwMERSFiles.DataSource = dtStructure;
gvwMERSFiles.DataBind();


also on clicking the Cancel(cancel edit) the cell content is retrieved correctly, that means the data is not lost...
Any help pls...