Interested to Buy Any Domain ? << Click Here >> for more details...
What is the difference between <%#%> and <%=%>?
- 5 Answers
- 10396 Views
- IBS, I also Faced
- E-Mail Answers
Answer Posted / vinodh reddy
I was a little confused about the difference between <%=
expression %> and <%# expression %> in ASP.NET. It seems
like both work in a lot of cases, but in other cases, only
the # (data binding) version works. So, I decided to dig
into it a little bit. To try it out I built this simple
page:
<%@ Page Language="C#" AutoEventWireup="true"
CodeFile="Default.aspx.cs" Inherits="_Default" %><!DOCTYPE
html PUBLIC "-//W3C//DTD XHTML 1.0
Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-
transitional.dtd"><html
xmlns="http://www.w3.org/1999/xhtml" ><head
runat="server"> <title>Untitled
Page</title></head><body> <form id="form1"
runat="server"> <div> <p>Equals: <%=
this.TestValue %></p> <p>Pound: <%# this.TestValue %
></p> <p>Equals label: <asp:Label runat="server"
ID="_equals" Text="<%= this.TestValue %>" /></p>
<p>Pound label: <asp:Label runat="server" ID="_pound"
Text="<%# this.TestValue %>" /></p> </div>
</form></body></html>
And the code behind is:
public partial class _Default : System.Web.UI.Page {
protected void Page_Load(object sender, EventArgs e)
{ _testValue = "2"; } protected void
Page_PreRenderComplete(object sender, EventArgs e)
{ // DataBind(); _testValue = "3"; }
public string TestValue { get { return
_testValue; } } private string _testValue = "1";}
Here's what the result is when the DataBind() line is
commented out:
Equals: 3
Pound:
Equals label:
Pound label:
And, when it's not commented out:
Equals: 3
Pound: 2
Equals label:
Pound label: 2
At first glance it looks like the Equals label case did
nothing. But, if you view source, you see:
<p>Equals label: <span id="_equals"><%= this.TestValue %
></span></p>
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.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
What do you mean by query string?
What are asp.net web forms?
what cut off mark for po's,what questions they asked for interview?
What is the used of "ispostback" property?
What are the navigation ways between pages available in ASP.NET?
Explain the difference between the web config and machine config.
What is autopostback true?
Explain the server control events of asp.net ?
Define viewstate in .net?
What are the disadvantages of view state?
Describe Segmentation With Paging?
What is state management in .net?
How will you load dynamic assembly?
How many types cache in asp net?
Can I combine classic asp and asp.net pages?
