Pardon my ASP ignorance, but what's the difference?
These are somewhat informally referred to as "bee stings". There are 4 types:
<%# %>
is invoked during the DataBinding phase.
<%= %>
is used to get values from code to the UI layer. Meant for backward compatibility with ASP applications. Shouldn't use in .NET.
<%@ %>
represents directives and allow behaviors to be set without resorting to code.
<%: %>
(introduced in ASP.NET 4) is the same as %=
, but with the added functionality of HtmlEncoding the output. The intention is for this to be the default usage (over %=
) to help shield against script injection attacks.
Directives specify settings that are used by the page and user-control compilers when the compilers process ASP.NET Web Forms pages (.aspx files) and user control (.ascx) files.
ASP.NET treats any directive block (<%@ %>) that does not contain an explicit directive name as an @ Page directive (for a page) or as an @ Control directive (for a user control).
@Esteban - Added a msdn link to directives. If you need...more explanation, please let me know.
See http://weblogs.asp.net/leftslipper/archive/2007/06/29/how-asp-net-databinding-deals-with-eval-and-bind-statements.aspx
As Albert says, it's all to do with parsing databinding statements.
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