what's the difference between and

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i used to make a dynamic css by embed cs code, like so:

HTML

<div class="<%# Request.RawUrl.Contains(" personinformation.aspx=") ? " xx=" : " zh_x_z=" %>" /div>

doesn't work, but the following does:

HTML

<div class="<%= Request.RawUrl.Contains(" personinformation.aspx=") ? " xx=" : " zh_x_z=" %>" /div>

can you tell me the reason or principle of that

Posted 18-Aug-10 15:38pm

richardqiaolixin

Updated 18-Aug-10 15:50pm

#realJSOP

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Al-Farooque Shubho · Answer 1 · 2010-08-18T16:32:00

"<%# %>" is a DataBinding expression. On the other hand, <%= %> is an expression that simply executes in server as Response.Write("") and outputs something int the browser.

Suppose you use a Server control that has a DataSource property and this is Template based (GridView,DataList etc) Server control. Now if you bind the datasource of that control with some compatible data (Say, a collection), at runtime, you can bind a property of an object within that datasource to a control within the template of the control. See http://msdn.microsoft.com/en-us/library/ms178366.aspx[^] to learn more.

In your case, you want to output your class name based upon a condition. So, you should yous "<%= %>" expression and hence, this is working.
Obviously, as you are not using any Template based Server control here and you are not binding any datasource. So, the databinding expression "<%# %>" is not working.