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copied!<p>Partial answer</p> <p>quoted from Mike Banavige</p> <blockquote> <p><% %> An embedded code block is server code that executes during the page's render phase. The code in the block can execute programming statements and call functions in the current page class. <a href="http://msdn2.microsoft.com/en-gb/library/ms178135(vs.80).aspx" rel="nofollow noreferrer">http://msdn2.microsoft.com/en-gb/library/ms178135(vs.80).aspx</a></p> <p><%= %> most useful for displaying single pieces of information. <a href="http://msdn2.microsoft.com/en-us/library/6dwsdcf5(VS.71).aspx" rel="nofollow noreferrer">http://msdn2.microsoft.com/en-us/library/6dwsdcf5(VS.71).aspx</a></p> <p><%# %> Data Binding Expression Syntax. <a href="http://msdn2.microsoft.com/en-us/library/bda9bbfx.aspx" rel="nofollow noreferrer">http://msdn2.microsoft.com/en-us/library/bda9bbfx.aspx</a></p> <p><%$ %> ASP.NET Expression. <a href="http://msdn2.microsoft.com/en-us/library/d5bd1tad.aspx" rel="nofollow noreferrer">http://msdn2.microsoft.com/en-us/library/d5bd1tad.aspx</a></p> <p><%@ %> Directive Syntax. <a href="http://msdn2.microsoft.com/en-us/library/xz702w3e(VS.80).aspx" rel="nofollow noreferrer">http://msdn2.microsoft.com/en-us/library/xz702w3e(VS.80).aspx</a></p> <p><%-- --%> Server-Side Comments. <a href="http://msdn2.microsoft.com/en-US/library/4acf8afk.aspx" rel="nofollow noreferrer">http://msdn2.microsoft.com/en-US/library/4acf8afk.aspx</a></p> </blockquote> <p>Update:</p> <p>Okay this appears to work</p> <pre><code><asp:Label ID="MyLabel" runat="server" Text='<%# MyProperty%>'></asp:Label> </code></pre> <p>If I use the eval syntax then I get an error about databound control or I use the <% then I get a server side controls error. Any more color appreciated.. not sure I really understand what is going on.</p> <p>Perhaps it has something to do with the render phase.</p> <p>Few more observations:</p> <p>I can use <%= without databinding and get the property value but can not use it in a server side control without getting error.</p> <p>If I use <%# in server side control but I'm required to do a Page.Databind.</p> <p>Interestingly, I can use either <%= or <%# when I want to render text that is not inside a control. Although the latter requires databinding.</p> <p>The new <%: syntax is explained, also called code expression syntax </p> <blockquote> <p>With ASP.NET 4 we are introducing a new code expression syntax (<%: %>) that renders output like <%= %> blocks do – but which also automatically HTML encodes it before doing so.</p> </blockquote> <p><a href="http://weblogs.asp.net/scottgu/new-lt-gt-syntax-for-html-encoding-output-in-asp-net-4-and-asp-net-mvc-2" rel="nofollow noreferrer">http://weblogs.asp.net/scottgu/new-lt-gt-syntax-for-html-encoding-output-in-asp-net-4-and-asp-net-mvc-2</a></p>

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