Элементы-потребители данных. Data-Bound Controls

<asp:SqlDataSource ID="SqlDataSource1" runat="server" 
    ConnectionString="<%$ 
ConnectionStrings:DemoBaseConnectionString %>"
    SelectCommand="dbo.SelectUsers" 
SelectCommandType="StoredProcedure" 
    DeleteCommand="dbo.DeleteUser"  
DeleteCommandType="StoredProcedure" 
    UpdateCommand="dbo.EditUser" 
UpdateCommandType="StoredProcedure" 
    InsertCommand="dbo.EditUser" 
InsertCommandType="StoredProcedure"
    OldValuesParameterFormatString="">
    <InsertParameters>
        <asp:Parameter Direction="ReturnValue" Name="RETURN_VALUE" 
            Type="Int32" />
        <asp:Parameter Name="UID" Type="Int32" DefaultValue="0" />
        <asp:ControlParameter Name="Name" Type="String" 
ControlID="NameTextBox"/>
        <asp:ControlParameter Name="Comments" Type="String" 
ControlID="CommentTextBox" PropertyName="Text"/>
        <asp:ControlParameter Name="Registered"  Type="Boolean" 
ControlID="Registered" PropertyName="Checked"/>
    </InsertParameters>
    <UpdateParameters>
        <asp:Parameter Direction="ReturnValue" 
Name="RETURN_VALUE"
          Type="Int32" />
        <asp:ControlParameter Name="UID" Type="Int32" 
ControlID="HiddenField1" />
        <asp:ControlParameter Name="Name" Type="String" 
ControlID="NameTextBox"/>
        <asp:ControlParameter Name="Comments" Type="String" 
ControlID="CommentTextBox"/>
        <asp:ControlParameter Name="Registered"  Type="Boolean" 
ControlID="Registered" PropertyName="Checked"/>
    </UpdateParameters>
    <DeleteParameters> 
        <asp:ControlParameter ControlID="HiddenField1" 
PropertyName="Value" Name="UID" Type="Int32" /> 
    </DeleteParameters> 
</asp:SqlDataSource>

<asp:DataGrid id="UsersDataGrid"  runat="server" 
    AutoGenerateColumns="False" DataKeyField="UID" 
    OnDeleteCommand="UsersDataGrid_DeleteCommand" 
    OnUpdateCommand="UsersDataGrid_UpdateCommand" 
    OnEditCommand="UsersDataGrid_EditCommand" 
DataSourceID="SqlDataSource1"
    AllowSorting="True" Caption="Users" CaptionAlign="Top"> 
    <Columns>
    <asp:TemplateColumn HeaderText= "Имя"> 
      <ItemTemplate> 
        <asp:Label id="Label1" runat="server" 
        Text='<%#DataBinder.Eval(Container, "DataItem.Name")%>'>
        </asp:Label>
      </ItemTemplate> 
      <EditItemTemplate> 
        <asp:TextBox id=NameTextBox runat="server" 
        Text='<%# DataBinder.Eval(Container, "DataItem.Name") %>'>
        </asp:TextBox>
      </EditItemTemplate>
    </asp:TemplateColumn> 
    <asp:TemplateColumn HeaderText="Комментарии">
      <ItemTemplate> 
        <asp:Label id="Label2" runat="server" Text='<%# 
DataBinder.Eval(Container, "DataItem.Comments")%>'></asp:Label>
      </ItemTemplate>
      <EditItemTemplate>
        <asp:TextBox id= CommentTextBox runat="server" Text='<%# 
DataBinder.Eval(Container, "DataItem.Comments")%>'>
        </asp:TextBox>
      </EditItemTemplate>
    </asp:TemplateColumn>
    <asp:TemplateColumn HeaderText= "Зарегистрирован">
      <ItemTemplate>
        <asp:CheckBox  runat="server" ID="Registered" 
Checked='<%# (bool) DataBinder.Eval(Container, 
"DataItem.isRegistered") %>'
              Enabled="False"></asp:CheckBox >
      </ItemTemplate>
      <EditItemTemplate>
        <asp:CheckBox runat="server" ID="Registered" Checked='<%# 
(bool) DataBinder.Eval(Container, "DataItem.isRegistered") 
%>'></asp:CheckBox>
      </EditItemTemplate>
      </asp:TemplateColumn>
    <asp:TemplateColumn>
      <ItemTemplate>
        <asp:LinkButton id="LinkButton1" runat="server" 
CommandName="edit">редактировать</asp:LinkButton> ::
        <asp:LinkButton id="LinkButton2" runat="server" 
CommandName="delete">удалить</asp:LinkButton>
      </ItemTemplate>
      <EditItemTemplate>
        <asp:LinkButton id="LinkButton3" runat="server" 
CommandName="update">принять</asp:LinkButton> ::
        <asp:LinkButton id="LinkButton4" runat="server" 
CommandName="cancel">отменить</asp:LinkButton>
      </EditItemTemplate>
    </asp:TemplateColumn>
  </Columns>
</asp:DataGrid>

<asp:TextBox ID="NameTextBox" runat="server" ></asp:TextBox>
<asp:TextBox ID="CommentTextBox" 
runat="server"></asp:TextBox>
<asp:CheckBox ID="Registered" runat="server" /><br /><br />
<asp:Button ID="Button1" runat="server" Text="Add" 
OnClick="Add_Click" />
<asp:HiddenField ID="HiddenField1" runat="server" />

protected void UsersDataGrid_DeleteCommand(object source, 
System.Web.UI.WebControls.DataGridCommandEventArgs e)
{
    HiddenField1.Value = 
UsersDataGrid.DataKeys[e.Item.ItemIndex].ToString();
    // Удаление
    SqlDataSource1.Delete();
    // Обновление данных после удаления
    UsersDataGrid.DataBind();
}

protected void Add_Click(object sender, EventArgs e)
{
    SqlDataSource1.Insert();
    UsersDataGrid.DataBind();
}