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Question 
What is the difference between <%#%> and <%=%>?
 Question Submitted By :: Lakshmi
I also faced this Question!!     Rank Answer Posted By  
 
  Re: What is the difference between <%#%> and <%=%>?
Answer
# 1		 
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.
 
Is This Answer Correct ?    4 Yes 0 No
Archana
 
  Re: What is the difference between <%#%> and <%=%>?
Answer
# 2		 
have a look at this link


http://blogs.msdn.com/dancre/archive/2007/02/13/the-
difference-between-lt-and-lt-in-asp-net.aspx
 
Is This Answer Correct ?    0 Yes 0 No
Ravindarjobs
[IGSA LABS]
 
 
 
  Re: What is the difference between <%#%> and <%=%>?
Answer
# 3		 
<%# %> is used for databinding
like <%#Eval("id") %>OR <%#Bind("id") %> 
<%=%> is used only for printing something 
like <%= DateTime.Now.ToString()%>
 
Is This Answer Correct ?    2 Yes 0 No
Amit Kumar
 
  Re: What is the difference between <%#%> and <%=%>?
Answer
# 4		 
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
Vinodh Reddy
 

 
 
 
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