¿Cómo puedo ACTUALIZAR columnas específicas de GridView basadas en un CheckBox en una columna?

Mi GridView tiene una casilla de verificación "activa" para indicar si el registro está activo o no. Es solo una bandera, un valor de bit en la base de datos.

Necesito ACTUALIZAR los campos "ActivatedBy" y "DeactivatedBy" cuando un usuario marca o desmarca CheckBox (en modo de edición).

Actualmente estoy actualizando el campo "UpdatedBy" cada vez que se actualiza una fila, llenándola con @UserName.

Pero no sé cómo actualizar programáticamente los campos ActivatedBy o DeactivatedBy solo cuando CheckBox está marcado o desmarcado respectivamente. Esto es solo para registrar quién cambia la casilla de verificación (@UserName es el parámetro de trabajo).

Suponga que necesito los detalles que se me explican. Hago. ;-) Solo estoy aprendiendo C # y GridViews son mi ruina. ¡Gracias!

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Admin.aspx.cs" Inherits="Admin" MaintainScrollPositionOnPostback="true" %>

<!DOCTYPE html>

<html>
<head runat="server">
    <title>Admin</title>
    <style>
        body {
            font-family:Arial;
            font-size:12px;
        }
    </style>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <asp:GridView ID="GridView1" runat="server" AllowSorting="True" AutoGenerateColumns="False" CellPadding="4" DataKeyNames="programid" DataSourceID="ITAAdminSqlDataSource" ForeColor="#333333" GridLines="None">
            <AlternatingRowStyle BackColor="White" />
            <Columns>
                <asp:CommandField ShowEditButton="True" ShowSelectButton="True" />
                <asp:BoundField DataField="programid" HeaderText="programid" InsertVisible="False" ReadOnly="True" SortExpression="programid" Visible="False" />
                <asp:BoundField DataField="OccGroup" HeaderText="Occ Group" SortExpression="OccGroup" />
                <asp:BoundField DataField="Provider" HeaderText="Provider" SortExpression="Provider" />
                <asp:BoundField DataField="Program" HeaderText="Program" SortExpression="Program" />
                <asp:BoundField DataField="OnetCode" HeaderText="Onet Code" SortExpression="OnetCode" />
                <asp:BoundField DataField="Address" HeaderText="Address" SortExpression="Address" />
                <asp:BoundField DataField="City" HeaderText="City" SortExpression="City" />
                <asp:BoundField DataField="Telephone" HeaderText="Telephone" SortExpression="Telephone" >
                <ItemStyle Wrap="False" />
                </asp:BoundField>
                <asp:BoundField DataField="TuitionCosts" DataFormatString="{0:c}" HeaderText="Tuition" HtmlEncode="False" SortExpression="TuitionCosts" />
                <asp:BoundField DataField="OtherCosts" DataFormatString="{0:c}" HeaderText="Other Costs" HtmlEncode="False" SortExpression="OtherCosts" />
                <asp:BoundField DataField="SpecialConditions" HeaderText="Special Conditions" SortExpression="SpecialConditions" />
                <asp:BoundField DataField="Credential" HeaderText="Credential" SortExpression="Credential" />
                <asp:CheckBoxField DataField="Active" HeaderText="Active" SortExpression="Active" />
                <asp:BoundField DataField="DateEntered" DataFormatString="{0:d}" HeaderText="Date Entered" HtmlEncode="False" SortExpression="DateEntered" />
                <asp:BoundField DataField="EnteredBy" HeaderText="Entered By" SortExpression="EnteredBy" />
                <asp:BoundField DataField="DateUpdated" DataFormatString="{0:d}" HeaderText="Date Updated" HtmlEncode="False" SortExpression="DateUpdated" />
                <asp:BoundField DataField="UpdatedBy" HeaderText="Updated By" SortExpression="UpdatedBy" />
                <asp:BoundField DataField="DateActivated" DataFormatString="{0:d}" HeaderText="Date Activated" HtmlEncode="False" SortExpression="DateActivated" />
                <asp:BoundField DataField="ActivatedBy" HeaderText="Activated By" SortExpression="ActivatedBy" />
                <asp:BoundField DataField="DateDeactivated" DataFormatString="{0:d}" HeaderText="Date Deactivated" HtmlEncode="False" SortExpression="DateDeactivated" />
                <asp:BoundField DataField="DeactivatedBy" HeaderText="Deactivated By" SortExpression="DeactivatedBy" />
            </Columns>
            <EditRowStyle BackColor="Tomato" />
            <FooterStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
            <HeaderStyle BackColor="#507CD1" Font-Bold="True" ForeColor="White" />
            <PagerStyle BackColor="#2461BF" ForeColor="White" HorizontalAlign="Center" />
            <RowStyle BackColor="#EFF3FB" />
            <SelectedRowStyle BackColor="#D1DDF1" Font-Bold="True" ForeColor="#333333" />
            <SortedAscendingCellStyle BackColor="#F5F7FB" />
            <SortedAscendingHeaderStyle BackColor="#6D95E1" />
            <SortedDescendingCellStyle BackColor="#E9EBEF" />
            <SortedDescendingHeaderStyle BackColor="#4870BE" />
        </asp:GridView>
        <asp:SqlDataSource ID="ITAAdminSqlDataSource" runat="server" ConnectionString="<%$ ConnectionStrings:ITAAdminConnectionString %>" 
            DeleteCommand="DELETE FROM [programs] WHERE [programid] = @programid" 
            InsertCommand="INSERT INTO [programs] ([OccGroup], [Provider], [Program], [OnetCode], [Address], [City], [Telephone], [TuitionCosts], [OtherCosts], [SpecialConditions], [Credential], [Active], [DateEntered], [EnteredBy], [DateUpdated], [UpdatedBy], [DateActivated], [ActivatedBy], [DateDeactivated], [DeactivatedBy]) VALUES (@OccGroup, @Provider, @Program, @OnetCode, @Address, @City, @Telephone, @TuitionCosts, @OtherCosts, @SpecialConditions, @Credential, @Active, @DateEntered, @EnteredBy, @DateUpdated, @UpdatedBy, @DateActivated, @ActivatedBy, @DateDeactivated, @DeactivatedBy)" 
            SelectCommand="SELECT [programid], [OccGroup], [Provider], [Program], [OnetCode], [Address], [City], [Telephone], [TuitionCosts], [OtherCosts], [SpecialConditions], [Credential], [Active], [DateEntered], [EnteredBy], [DateUpdated], [UpdatedBy], [DateActivated], [ActivatedBy], [DateDeactivated], [DeactivatedBy] FROM [programs] ORDER BY [Provider], [Program]" 
            UpdateCommand="UPDATE [programs] SET [OccGroup] = @OccGroup, [Provider] = @Provider, [Program] = @Program, [OnetCode] = @OnetCode, [Address] = @Address, [City] = @City, [Telephone] = @Telephone, [TuitionCosts] = @TuitionCosts, [OtherCosts] = @OtherCosts, [SpecialConditions] = @SpecialConditions, [Credential] = @Credential, [Active] = @Active, [DateEntered] = @DateEntered, [EnteredBy] = @EnteredBy, [DateUpdated] = GETDATE(), [UpdatedBy] = @UserName, [DateActivated] = @DateActivated, [ActivatedBy] = @ActivatedBy, [DateDeactivated] = @DateDeactivated, [DeactivatedBy] = @DeactivatedBy WHERE [programid] = @programid">
            <DeleteParameters>
                <asp:Parameter Name="programid" Type="Int32" />
            </DeleteParameters>
            <InsertParameters>
                <asp:Parameter Name="OccGroup" Type="String" />
                <asp:Parameter Name="Provider" Type="String" />
                <asp:Parameter Name="Program" Type="String" />
                <asp:Parameter Name="OnetCode" Type="Int32" />
                <asp:Parameter Name="Address" Type="String" />
                <asp:Parameter Name="City" Type="String" />
                <asp:Parameter Name="Telephone" Type="String" />
                <asp:Parameter Name="TuitionCosts" Type="Decimal" />
                <asp:Parameter Name="OtherCosts" Type="Decimal" />
                <asp:Parameter Name="SpecialConditions" Type="String" />
                <asp:Parameter Name="Credential" Type="String" />
                <asp:Parameter Name="Active" Type="Boolean" />
                <asp:Parameter DbType="Date" Name="DateEntered" />
                <asp:Parameter Name="EnteredBy" Type="String" />
                <asp:Parameter DbType="Date" Name="DateUpdated" />
                <asp:Parameter Name="UpdatedBy" Type="String" />
                <asp:Parameter Name="username" Type="String" DefaultValue="Anonymous" /> <%-- username parameter filled in Page_Init. use @username instead of UpdatedBy, ActivatedBy, etc. --%>
                <asp:Parameter DbType="Date" Name="DateActivated" />
                <asp:Parameter Name="ActivatedBy" Type="String" />
                <asp:Parameter DbType="Date" Name="DateDeactivated" />
                <asp:Parameter Name="DeactivatedBy" Type="String" />
            </InsertParameters>
            <UpdateParameters>
                <asp:Parameter Name="OccGroup" Type="String" />
                <asp:Parameter Name="Provider" Type="String" />
                <asp:Parameter Name="Program" Type="String" />
                <asp:Parameter Name="OnetCode" Type="Int32" />
                <asp:Parameter Name="Address" Type="String" />
                <asp:Parameter Name="City" Type="String" />
                <asp:Parameter Name="Telephone" Type="String" />
                <asp:Parameter Name="TuitionCosts" Type="Decimal" />
                <asp:Parameter Name="OtherCosts" Type="Decimal" />
                <asp:Parameter Name="SpecialConditions" Type="String" />
                <asp:Parameter Name="Credential" Type="String" />
                <asp:Parameter Name="Active" Type="Boolean" />
                <asp:Parameter DbType="Date" Name="DateEntered" />
                <asp:Parameter Name="EnteredBy" Type="String" />
                <asp:Parameter DbType="Date" Name="DateUpdated" />
                <asp:Parameter Name="UpdatedBy" Type="String" />
                <asp:Parameter Name="username" Type="String" DefaultValue="Anonymous" /> <%-- username parameter filled in Page_Init. use @username instead of UpdatedBy, ActivatedBy, etc. --%>
                <asp:Parameter DbType="Date" Name="DateActivated" />
                <asp:Parameter Name="ActivatedBy" Type="String" />
                <asp:Parameter DbType="Date" Name="DateDeactivated" />
                <asp:Parameter Name="DeactivatedBy" Type="String" />
                <asp:Parameter Name="programid" Type="Int32" />
            </UpdateParameters>
        </asp:SqlDataSource>
    </div>
    </form>
</body>
</html>


using System;
using System.Collections.Generic;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

public partial class Admin : System.Web.UI.Page
{
    protected string ClearDomain(string sItem) //Format username without domain
    {
        int sLoc = (sItem.IndexOf("\\") + 1);
        string sOutPut;
        sOutPut = sItem.Substring(sLoc);
        return sOutPut;
    }

    protected void Page_Load(object sender, EventArgs e)
    {
        //string usr;
        //usr = ClearDomain(User.Identity.Name.ToString());
    }

    protected void Page_Init(object sender, EventArgs e)
    {
        ITAAdminSqlDataSource.InsertParameters["UserName"].DefaultValue = ClearDomain(User.Identity.Name.ToString());
        ITAAdminSqlDataSource.UpdateParameters["UserName"].DefaultValue = ClearDomain(User.Identity.Name.ToString());
    }
}

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