asp.net'de <% %> etiketlerinin anlamları

Code in <% %> tags is for running arbitrary code, not for setting property values. 

Code in <%= %> tags is for rendering to the output stream. 

Code in <%# %> is for databinding.  

Code in <%$ %>is for expression bindings, but they execute too early in the page's life cycle.

Güzel makaleler:
Expressions vs. Statements, part 2: ASP.NET Code Block Types: http://michielvoo.net/blog/expressions-vs-statements-part-2-asp-net-code-block-types/

Using Expression Builders in ASP.NET: http://www.4guysfromrolla.com/articles/022509-1.aspx

Complex data binding expressions in ASP.NET: http://www.pluralsight-training.net/community/blogs/fritz/archive/2005/12/16/17507.aspx

Asp.net Expressions A Useful Feature: http://aspnetresources.com/blog/aspnet2_expressions

Kaynak:

http://stackoverflow.com/questions/1193256/sqldatasource-set-selectcommand-dynamicly