A tricky way to using <%# Bind %> in ASP.NET - asp.net

Question

In ASP.NET, I can use <%# Bind %> to achieve two-way data binding, then the data source control can complete update function for me.
However, I think it's only easy when you just show simple format, like
<%# Bind("InsertDate") %>
But, if I want to show 'N/A' when InsertDate is not exist. then how to use <%# Bind %> to achieve the condition check?
I know Bind function supports format string, like
<%# Bind("InsertDate", "0:{dd MMM yyyy}") %>
But it cannot change format base on InsertDate's content.
I even try to use:
<%# FormatString(Bind("InsertDate").ToString()) %>
It seems's not working which normally works for Eval function.
Another example is I have a bitwise column in table (like 5) which is represented by a checkboxlist wrapped by ListView control, like
<asp:checkboxlist>
<asp:ListItem value="1" text="OptionA">
<asp:ListItem value="2" text="OptionB">
<asp:ListItem value="4" text="OptionC">
</asp:checkboxlist>
then how to use <%# Bind %> to achieve two-way bind to bind the bitwise column to this checkboxlist?
Currently what I do is:
set checkboxlist's selected item(value) in ListView's ItemDataBound event handler
using a HiddenField and bind the data to this hiddenfield to
achieve two-way data bind.
In LivtView's ItemUpdating event handler, I update above ListViewUpdateEventArgs' NewValue property to the value I want. and then the EntityDataSource can do the update operation correctly.
But I think this method is not easy and good.
So is there any other better method to do this?

Answer 1

Try to make use of the public data type.
On your code-behind declare your variable as
public string name;
//Do whatever assignment operations to your variable "name"
And on your aspx page. You can call it
<% Response.Write(name); %>