What is the difference between and ?

What is the difference between <% %> and <%= %> in ASP.NET MVC? And when to use which?

Answers:

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Method 1

See also this question. MVC hasn’t changed how these bee-stings work, just how often they’re used.

Basically:

  • <% – execute code
  • <%@ – page directive
  • <%$ – resource access
  • <%= – explicit output to page
  • <%# – data binding
  • <%-- – server side comment block

Also new in ASP.Net 4:

  • <%: – writes out to the page, but with HTML encoded

Method 2

<%= %> writes to the output stream (usually html) while <% %> is for executing arbitrary script code.

Method 3

Say you have a method on your page, called “SayHello”:

protected string SayHello()
{
    return "Hello!";
}

And on your page, you have these statements:
first: <%= SayHello() %>
second: <% SayHello() %>

Your output will be:
first: Hello!
second:

when you use <%= %>, what you put in there is inserted into the html at that position. If you use <% %>, you’re just inserting some code into your page.

Method 4

<%= echos the statement out.

<% just runs it.


All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0

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