insert data from detailsview control to database

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ASP.NET

hello sir.
i want to insert data from details view to database.
i took a detailsview control and some textboxes, and one button. then how can i save the data to database.
my code is below.
if anybody know plz helpme.

<asp:DetailsView ID="DetailsView1" runat="server" AutoGenerateRows="False"
                        DataKeyNames="ProductID" AllowPaging="False" Width="500"
                        EnableViewState="False">
                        <AlternatingRowStyle BackColor="White" />
                        <headerstyle backcolor="Navy" forecolor="White"/>

                        <Fields>

                            <asp:TemplateField HeaderText ="Category-id">
                                <InsertItemTemplate >

                                </InsertItemTemplate>
                                <EditItemTemplate>
                                    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:TextBox ID="TxtCategoryid" runat="server"></asp:TextBox>
                                    <asp:Label ID="LabelCategoryid" runat="server" ></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>

                            <asp:TemplateField HeaderText ="Category-description">
                                <InsertItemTemplate >

                                </InsertItemTemplate>
                                <EditItemTemplate>

                                    <asp:Label ID="LabelCategoryid" runat="server" ></asp:Label>
                                </EditItemTemplate>
                                <ItemTemplate>
                                    <asp:TextBox ID="TxtCategorydescription" runat="server"></asp:TextBox>
                                    <asp:Label ID="LabelCategorydescription" runat="server" ></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>

                            <asp:TemplateField HeaderText ="Additional field 1">
                                <InsertItemTemplate >

                                </InsertItemTemplate>
                                <ItemTemplate>
                                    <asp:TextBox ID="TxtAdditionalfield1" runat="server" ></asp:TextBox>
                                    <asp:Label ID="LblAdditionalfield1" runat="server" ></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>

                            <asp:TemplateField HeaderText ="Additional field 2">
                                <ItemTemplate >
                                    <asp:TextBox ID="TxtAdditionalfield2" runat="server"></asp:TextBox>
                                    <asp:Label ID="LblAdditionalfield2" runat="server" ></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>

                            <asp:TemplateField HeaderText ="Additional field 3">
                                <ItemTemplate >
                                    <asp:TextBox ID="TxtAdditionalfield3" runat="server"></asp:TextBox>
                                    <asp:Label ID="LblAdditionalfield3" runat="server" ></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>

                            <asp:TemplateField HeaderText ="Additional field 4">
                                <ItemTemplate >
                                    <asp:TextBox ID="TxtAdditionalfield4" runat="server"></asp:TextBox>
                                    <asp:Label ID="LblAdditionalfield4" runat="server" ></asp:Label>
                                </ItemTemplate>
                            </asp:TemplateField>

                            <asp:TemplateField >
                                <ItemTemplate>
                                    <asp:Button ID="BtnSave" Text ="Save" runat="server" Width="80"/>
                                </ItemTemplate>
                            </asp:TemplateField>
                        </Fields>
                    </asp:DetailsView>