submit inputs from GridView Textbox

[VBnewbeee]

I want to gather inputs from Gridview textboxes and update the database with the inputs. I can't simply write a get() method to retrieve textbox inputs in this case. Can you shed me some light on how to get start with this? Thanks.

    <asp:GridView ID="GridView1" runat="server" AllowPaging="True" AllowSorting="True"
                AutoGenerateColumns="False" Font-Names="Verdana" Font-Size="9pt" OnPageIndexChanging="GridView1_PageIndexChanging"
                OnSelectedIndexChanged="GridView1_SelectedIndexChanged" 
                OnRowDataBound="GridView1_RowDataBound" OnSorting="GridView1_Sorting" 
                PageSize="5">
                <Columns>
                    <asp:TemplateField HeaderText="ID" SortExpression="ID">
                        <ItemTemplate>
                            <asp:Label ID="ID" runat="server" Text='<%# Eval("ID") %>' Width="80px"></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="LastName" SortExpression="LastName">
                        <ItemTemplate>
                            <asp:Label ID="LastName" runat="server" Text='<%# Eval("LastName") %>' Width="80px"></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="FirstName" SortExpression="FirstName">
                        <ItemTemplate>
                            <asp:Label ID="FirstName" runat="server" Text='<%# Eval("FirstName") %>' Width="80px"></asp:Label>
                        </ItemTemplate>
                    </asp:TemplateField>
                    <asp:TemplateField HeaderText="UserInput" SortExpression="UserInput">
                        <ItemTemplate>
                            <asp:TextBox ID="UserInput" runat="server" Text='<%# Eval("UserInput") %>'
                                Width="80px"></asp:TextBox>
                        </ItemTemplate>
                    </asp:TemplateField>
                </Columns>
            </asp:GridView>