Web Forms Inline Code Begin Tags

Question

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() %>
...

Answer 1

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