Differences between <%= and <%#?

Question

I have the following piece of code:

<div id='mymodal' class="modal hide fade <%# CssClass %>">
    <div class="modal-header">
        <asp:HyperLink ID="closePopup" NavigateUrl='<%# CloseLink %>' CssClass="close" runat="server" >&times;</asp:HyperLink>
        <h3>
            <asp:Literal ID="header" Text='<%# Header %>' runat="server" />
        </h3>
    </div>
    <div class="modal-body">
        <asp:Literal ID="body" Text='<%# Body %>'  runat="server" />
    </div>
</div>

The first CssClass binding works either with <%# or <%=, while the other ones only work with <%# + codebehind DataBind() (if I use <%=, then the two Literals display literally the "<%= Body %>" text).

What is the use of both approaches? Why does it work this way? Which are the advantages of one over the other?

But why does it behave differently on an ASP.NET control and a html tag? They both should databind properties to public properties of code behind. — David Jiménez Martínez, May 08 '14 at 09:14
Or http://stackoverflow.com/questions/115159/when-should-i-use-and-in-asp-net-controls — Wolfwyrd, May 08 '14 at 09:19

score 2 · Answer 1 · edited Jun 20 '20 at 09:12

2

<%= is mean for Response.Write()

<%# is used to data binding

referred From

Can you tell the differences between <%= %>, <%# %> and <%$ %> ASP.NET expressions?

I hops this links helps to you lot...

edited Jun 20 '20 at 09:12

Community

1
1

answered May 08 '14 at 09:19

Neel · Accepted Answer · 2014-05-08T09:20:08.050

As suggested by Dan Crevier

http://blogs.msdn.com/b/dancre/archive/2007/02/13/the-difference-between-lt-and-lt-in-asp-net.aspx

The literal expression made it down to the browser and it's just invalid HTML. What you can see as a result is:

•The <%= expressions are evaluated at render time

•The <%# expressions are evaluated at DataBind() time and are not evaluated at all if DataBind() is not called.

•<%# expressions can be used as properties in server-side controls. <%= expressions cannot.

So in short <%= %> is equivalent of Response.Write(); and

<%# %>  is used for data-binding expressions.

score 0 · Answer 3 · edited May 23 '17 at 11:57

0

<% %> is for inclusion of server-side code to the Render() method

<%# %> is used for data-binding expressions

To know more delimiters:

ASP.NET "special" tags

edited May 23 '17 at 11:57

Community

1
1

answered May 08 '14 at 09:17

Kumar Manish

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Its between `<%= %>` and `<%# %>`, not `<%@ %>` – TheGeekZn May 08 '14 at 09:18
my apologies, it's my mistake, now corrected it – Kumar Manish May 08 '14 at 09:20

Differences between <%= and <%#?

3 Answers3