Adding Texbox in gridview using Jquery

<asp:GridView ID="gdvInternallist" runat="server" Caption="InternalMarkEntry" CssClass="Grid"
                EmptyDataText="No Record found" Width="100%"

                  AutoGenerateColumns="False"
             >
                <HeaderStyle CssClass="GridHeader" />
                <AlternatingRowStyle CssClass="GridAltItem" />
                <Columns>



                        <asp:TemplateField HeaderText="Name" >

                              <ItemTemplate>
                                      <asp:Label ID="lblName" runat="server" Text='<%# Eval("Name") %>' ></asp:Label>

                              </ItemTemplate>
                     </asp:TemplateField>

                          <asp:TemplateField >
                          <HeaderTemplate>
                       <asp:Label ID="lblTest" runat="server" ></asp:Label>
                     </HeaderTemplate>
                              <ItemTemplate>
                                  <asp:TextBox ID="txtTest" runat="server" Height="24px" Width="73px" Text="2"
                                    ></asp:TextBox>

                              </ItemTemplate>
                     </asp:TemplateField>
                     <asp:TemplateField>
                     <HeaderTemplate>
                       <asp:Label ID="lbComponent" runat="server" ></asp:Label>
                     </HeaderTemplate>
                         <ItemTemplate>
                             <asp:TextBox ID="txtComponent" runat="server" Height="24px" Width="73px"></asp:TextBox>

                         </ItemTemplate>
                     </asp:TemplateField>
                     <asp:TemplateField >
                      <HeaderTemplate>
                       <asp:Label ID="lblAttendence" runat="server" ></asp:Label>
                     </HeaderTemplate>
                         <ItemTemplate>
                             <asp:TextBox ID="txtAttendence" runat="server" Height="24px" Width="73px"
                                 ></asp:TextBox>

                         </ItemTemplate>
                     </asp:TemplateField>
                       <asp:TemplateField >
                      <HeaderTemplate>
                       <asp:Label ID="lblTotal" runat="server" ></asp:Label>
                     </HeaderTemplate>
                         <ItemTemplate>
                             <asp:TextBox ID="txtTotal" runat="server" Height="24px" Width="73px"  Text="0"></asp:TextBox>

                         </ItemTemplate>
                     </asp:TemplateField>
                </Columns>
            </asp:GridView>

txtTotal.Text=txtComponent.Text+txtAttendence.Text+ txtTest.Text