add code in form view in insert mode

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C#

i m using form view control (in insert mode) i can't find any method to add code in cs file
i want with this code
when i click on get result button
number 1 + number 2
and show in result text box
and then after click insert link button save all data to database
aspx code

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<div style="text-align: center">
how to add two number using form view</div>
<div>
<asp:FormView ID="FormView1" runat="server" BackColor="White"
BorderColor="#DEDFDE" BorderStyle="None" BorderWidth="1px" CellPadding="4"
DataSourceID="addnumber" DefaultMode="Insert" ForeColor="Black"
GridLines="Vertical" style="margin-right: 572px" Width="810px">
<FooterStyle BackColor="#CCCC99" />
<RowStyle BackColor="#F7F7DE" />
<EditItemTemplate>
n1:
<asp:TextBox ID="n1TextBox" runat="server" Text='<%# Bind("n1") %>' />
<br />
n2:
<asp:TextBox ID="n2TextBox" runat="server" Text='<%# Bind("n2") %>' />
<br />
result:
<asp:TextBox ID="resultTextBox" runat="server" Text='<%# Bind("result") %>' />
<br />
<asp:LinkButton ID="UpdateButton" runat="server" CausesValidation="True"
CommandName="Update" Text="Update" />
<asp:LinkButton ID="UpdateCancelButton" runat="server"
CausesValidation="False" CommandName="Cancel" Text="Cancel" />
</EditItemTemplate>
<InsertItemTemplate>
<table style="width:100%;">
<tr>
<td class="style1">
number 1</td>
<td class="style2">
<asp:TextBox ID="n1TextBox" runat="server" Text='<%# Bind("n1") %>' />
</td>
<td>
<asp:LinkButton ID="InsertButton" runat="server" CausesValidation="True"
CommandName="Insert" Text="Insert" />
</td>
</tr>
<tr>
<td class="style1">
number 2</td>
<td class="style2">
<asp:TextBox ID="n2TextBox" runat="server"
ontextchanged="n2TextBox_TextChanged" Text='<%# Bind("n2") %>' />
</td>
<td>
<asp:LinkButton ID="InsertCancelButton" runat="server" CausesValidation="False"
CommandName="Cancel" Text="Cancel" />
</td>
</tr>
<tr>
<td class="style1">
</td>
<td class="style2">
<asp:Button ID="Button1" runat="server" onclick="Button1_Click"
Text="get result" />
</td>
<td>
</td>
</tr>
<tr>
<td class="style1">
result</td>
<td class="style2">
<asp:TextBox ID="resultTextBox" runat="server" Text='<%# Bind("result") %>' />
</td>
<td>
</td>
</tr>
</table>
<br />
</InsertItemTemplate>
<ItemTemplate>
n1:
<asp:Label ID="n1Label" runat="server" Text='<%# Bind("n1") %>' />
<br />
n2:
<asp:Label ID="n2Label" runat="server" Text='<%# Bind("n2") %>' />
<br />
result:
<asp:Label ID="resultLabel" runat="server" Text='<%# Bind("result") %>' />
<br />
</ItemTemplate>
<PagerStyle BackColor="#F7F7DE" ForeColor="Black" HorizontalAlign="Right" />
<HeaderStyle BackColor="#6B696B" Font-Bold="True" ForeColor="White" />
<EditRowStyle BackColor="#CE5D5A" Font-Bold="True" ForeColor="White" />
</asp:FormView>
<asp:AccessDataSource ID="addnumber" runat="server"
DataFile="~/App_Data/test.mdb"
InsertCommand="INSERT INTO [add] (n1, n2, result) VALUES (?, ?, ?)"
SelectCommand="SELECT [n1], [n2], [result] FROM [add]">
</asp:AccessDataSource>
</div>