I just wan to to know why these different begin tags exist, if there are still more and if they can be used interchangeably:
<%# Do.Something() %>
<%= Do.Something() %>
...
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The tags do different things. For example
<%= %>will write the result of the expression within the tags to the output, while<%# %>will use data-binding expressions to reference data from a data source. A fuller explanation can be found at http://weblogs.asp.net/ahmedmoosa/archive/2010/10/06/embedded-code-and-inline-server-tags.aspx