In ASP.Net, what is the difference between

See this question:
When should I use # and = in ASP.NET controls?

Summary from those answers:

There are a several different ‘bee-stings’:

• <%@ – Page/Control/Import/Register directive
• <%$ – Resource access and Expression building
• <%= – Explicit output to page, equivalent to <% Response.Write( ) %>
• <%# – Data Binding. It can only used where databinding is supported, or at the page level if you call Page.DataBind() in your code-behind.
• <%-- – Server-side comment block
• <%: – Equivalent to <%=, but it also html-encodes the output.