Can you suggest me some idea how to achieve this

You can use modal popup for for updates. In my View that would be more easier

http://www.aspsnippets.com/Articles/Add-Edit-Update-Records-in-GridView-using-Modal-Popup-in-ASP.Net.aspx

Actually I have used 1 single gridview to insert contact person details.. Later i am loading this same gridview with contact person details to update it.. In the Empty data template i have a footer with a add link button and in the gridview columns aslo i have a footer with add link button again which is creating problem.

You can assign same OnClick event to both the add buttons

Actually u r not getting my point.. When the gridview is loaded the empty data template becomes invisible right? Later the gridview which has a footer the the columns becomes visible which also has add link button and that gets fired.. In case i want to add multiple contact details it is creating problem.

My gridview aspx code is as below:

                            <asp:GridView ID="GVContact" runat="server" AutoGenerateColumns="False" 
                                ShowFooter="True" Width="500px" Font-Names="Tahoma" Font-Size="8.25pt" 
                                ForeColor="Gray" 
                                onrowupdating="GVContact_RowUpdating" 
                                onrowcommand="GVContact_RowCommand" 
                                onrowcancelingedit="GVContact_RowCancelingEdit" 
                                onrowediting="GVContact_RowEditing">
                                <EmptyDataTemplate>
                                
                                <table cellspacing="0" rules="all" style="font-family: Tahoma;
                                 font-size: 8.25pt; width: 550px; border-collapse: collapse;">
                                    <tr style="background-color: White;">
                                    <th>ID</th>
                                    <th scope="col">
                                    Contact Name
                                    </th>
                                    <th scope="col">
                                     Contact Email ID
                                    </th>
                                    <th scope="col">
                                    Contact Mobile
                                    </th>
                                    <th scope="col">
                                    Contact Status
                                    </th>
                                    </tr>
                
                                    <tr>
                                    <td>   <asp:Label ID="lblContactID" runat="server"></asp:Label></td>
                                    <td>
                                    <asp:TextBox ID="txtcontact" CssClass="TextBoxStyle" runat="server"></asp:TextBox>
                                    </td>
                                    <td>
                                    <asp:TextBox ID="txtCemail" CssClass="TextBoxStyle" runat="server"></asp:TextBox>
                                    </td>
                                    <td>
                                    <asp:TextBox ID="txtCmobile" CssClass="TextBoxStyle" runat="server"></asp:TextBox>
                                    </td>
                                    <td>
                                    <asp:CheckBox ID="chkstatus" Checked="true" runat="server" />
                                    
                                     <asp:LinkButton ID="lnkaddContact" Font-Underline="false" CommandName="AddContactPerson" Font-Bold="true" ForeColor="Gray" runat="server">add</asp:LinkButton>
                                    </td>
                                    </tr>
                                    </table>
                                    
                                    </EmptyDataTemplate>
                                <Columns>
                                <asp:TemplateField>
                                <ItemTemplate>
                                    <asp:Label ID="lblContactID" runat="server" Text='<%#Eval("ContactPersonID") %>'></asp:Label>
                                </ItemTemplate>
                                </asp:TemplateField>
                                <asp:TemplateField HeaderText="Contact Name">
                                <ItemTemplate>
                                    <asp:Label ID="lblcontact" Text='<%#Eval("ContactName") %>' CssClass="TextBoxStyle" runat="server"></asp:Label>
                                </ItemTemplate>
                                <EditItemTemplate>
                                 <asp:TextBox ID="txtContactName" Text='<%#Eval("ContactName") %>' runat="server" CssClass="GridItemStyle" 
                                 Width="90px"></asp:TextBox>
                                </EditItemTemplate>
                                <FooterTemplate>
                                    <asp:TextBox ID="txtcontact" CssClass="TextBoxStyle" runat="server"></asp:TextBox>
                                </FooterTemplate>
                                </asp:TemplateField>
                                
                                  <asp:TemplateField HeaderText="Email ID">
                                <ItemTemplate>
                                    <asp:Label ID="lblemail" CssClass="TextBoxStyle" runat="server" Text='<%#Eval("ContactEmailID") %>'></asp:Label>
                                </ItemTemplate>
                                 <EditItemTemplate>
                                 <asp:TextBox ID="txtemail" runat="server" Text='<%#Eval("ContactEmailID") %>' CssClass="GridItemStyle" Width="90px"></asp:TextBox>

                                 </EditItemTemplate>
                                 <FooterTemplate>
                                     <asp:TextBox ID="txtCemail" CssClass="TextBoxStyle" runat="server"></asp:TextBox>
                                 </FooterTemplate>
                                </asp:TemplateField>
                                
                                  <asp:TemplateField HeaderText="Mobile">
                                <ItemTemplate>
                                    <asp:Label ID="lblmobile" Text='<%#Eval("ContactMobile") %>' CssClass="TextBoxStyle" runat="server"></asp:Label>
                                </ItemTemplate>
                                 <EditItemTemplate>
                                  <asp:TextBox ID="txtmob1" runat="server" Text='<%#Eval("ContactMobile") %>' CssClass="GridItemStyle" Width="90px"></asp:TextBox>
                                 </EditItemTemplate>
                                 <FooterTemplate>
                                     <asp:TextBox ID="txtCmobile" CssClass="TextBoxStyle" runat="server"></asp:TextBox>
                                 </FooterTemplate>
                                </asp:TemplateField>
                                
                                  <asp:TemplateField HeaderText="Status">
                                <ItemTemplate>
                                    <asp:Label ID="lblstatus" CssClass="TextBoxStyle" runat="server" Text='<%#Eval("ContactStatus") %>'></asp:Label>
                                </ItemTemplate>
                                 <EditItemTemplate>
                                     <asp:CheckBox ID="chkstatus" Checked="true" runat="server" />
                                 </EditItemTemplate>
                                 
                                 <FooterTemplate>
                                  <asp:CheckBox ID="chkstatus" Checked="true" runat="server" />
                                    <%-- <asp:Button ID="btnadd" Width="50px" Font-Bold="true" runat="server" Text="add" CssClass="TextBoxStyle" />--%>
                                     <asp:LinkButton ID="lnkadd" Font-Underline="false" CommandName="AddContact" Font-Bold="true" ForeColor="Gray" runat="server">add</asp:LinkButton>
                                 </FooterTemplate>
                                </asp:TemplateField>
                                
                                  <asp:CommandField  HeaderText="Edit" ControlStyle-Font-Underline="false" 
                                        ControlStyle-CssClass="TextBoxStyle" ShowEditButton="True" >
                                      <ControlStyle CssClass="TextBoxStyle" Font-Underline="False" />
                                    </asp:CommandField>
                                </Columns>
                                <HeaderStyle BorderColor="#666666" BorderStyle="Solid" BorderWidth="2px" />
                            </asp:GridView>
                            

Yes I know that there are 2 add buttons one in Footer and one in EmptyDataTemplate. So what you want to do with the Footer Add button