Gridview binding data not deleted properly


I am using Gridview and binding some fields from compdata.

But, when i am trying to delete, the data will not be deleting the specific row.

what is the problem..?



 <asp:GridView ID="gdView1" runat="server" BackColor="White" BorderColor="#336666"
    DataSourceID="SqlDataSource1" AutoGenerateColumns="false" PageSize="10" Width="80%"
      GridLines="Horizontal">
        <RowStyle BackColor="White" ForeColor="#355333" />
        <FooterStyle BackColor="White" ForeColor="#355333" />
        <PagerStyle BackColor="#334343" ForeColor="White" HorizontalAlign="Center" />
            <SelectedRowStyle BackColor="#332323" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#232366" Font-Bold="True" ForeColor="White" />
              <Columns>
                 <asp:TemplateField>
                     <HeaderTemplate>Sno</HeaderTemplate>
                        <ItemTemplate>
                            <asp:Label runat="server" ID="Lno" Text="<%#Container.DataitemIndex + 1 %>"></asp:Label>
                        </ItemTemplate>
                 </asp:TemplateField>
                 <asp:BoundField DataField="EmpNo" HeaderText="Emp No" />
                 <asp:BoundField DataField="EmpDesc" HeaderText="Emp Description" />
                 <asp:BoundField DataField="EPFNo" HeaderText="EPF No" />
                                       
                                        <asp:TemplateField>
                                            <ItemTemplate>
                                                <asp:LinkButton ID="DeleteBtn" runat="server" CommandName="Delete" OnClientClick="return isDelete();">Delete
                                                </asp:LinkButton>
                                            </ItemTemplate>
                                        </asp:TemplateField>
                                    </Columns>
                                </asp:GridView>

 <asp:SqlDataSource ID="SqlDataSource1" runat="server" ConnectionString="<%$ ConnectionStrings:compdata %>"
      SelectCommand="Select *,convert(varchar,joinDate,106) as joinDate from empdata"
      DeleteCommand="delete from empdata where [ID] =@ID">
                                    <DeleteParameters>
                                        <asp:Parameter Name="ID" Type="Int32" />
                                    </DeleteParameters>
                                </asp:SqlDataSource>

  <script type="text/javascript">
        function isDelete() {
            return confirm("Do you want to delete this row ?");
        }
    </script>