ASP.NET angle bracket with '#' or '='. What's the difference?

Duplicate: http://stackoverflow.com/questions/649428/asp-net-special-tags

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I work with PHP who using or for server tag ,but what the meaning and usage in ASP.NET's <%# %> and <%= %> ??

thanks you.

From stackoverflow

• <%# %> indicates a data binding operation and is only valid within DataBinding controls (such as a DataGrid, ListView, etc).

  <%= %> is a shortcut to HttpContext.Current.Response.Write. It'll call the .ToString() method on any object/ method call (execpt for strings, it may be smart enough to not ToString a string).

• See this:
  http://stackoverflow.com/questions/517721/in-asp-net-what-is-the-difference-between-and