<asp:SqlDataSource ID="AddProductDataSource" runat="server" ConnectionString="..."
InsertCommand="INSERT INTO Products(ProductName, CategoryID, UnitPrice, Discontinued) VALUES (@ProductName, @CategoryID, @UnitPrice, @Discontinued)"
ProviderName="...">
<InsertParameters>
<asp:ControlParameter ControlID="ProductName" Name="ProductName" PropertyName="Text" />
<asp:ControlParameter ControlID="Categories" Name="CategoryID" PropertyName="SelectedValue" />
<asp:ControlParameter ControlID="UnitPrice" Name="UnitPrice" PropertyName="Text" />
<asp:ControlParameter ControlID="Discontinued" Name="Discontinued" PropertyName="Checked" />
</InsertParameters>
</asp:SqlDataSource>