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Code Render Blocks

.NET Framework 3.5

Code render blocks define inline code or inline expressions that execute when the page is rendered. There are two styles of code render blocks: inline code and inline expressions. Use inline code to define self-contained lines or blocks of code. Use inline expressions as a shortcut for calling the Write method.

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<% inline code %>
<%=inline expression %>

Remarks

A compilation error occurs if you try to include the character sequence %> anywhere inside a code render block. That sequence can only be used to close the code render block. For example, the following code will cause an error:

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<%@ page language="C#" %>
   <%
      Response.Write(" %>");
   %>

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<%@ page language="VB" %>
   <%
      Response.Write("%>)
   %>

To work around this error, you can build a string containing the sequence of characters, as in the following code example:

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<%@ page language="C#" %>
   <%
      String s = "%" + ">";
      Response.Write(s);
   %>

Note:
Unlike Active Server Pages (ASP), in ASP.NET it is invalid to declare a function or subroutine within a code render block (between <% and %> tags).

Example

The following code example shows how you can use the code render blocks to display the same HTML text in a number of different font sizes.

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<% for (int i=0; i<10; i++) { %>
     <font size="<%=i %>"> Hello World! </font>
<% } %>

Concepts

ASP.NET Web Page Syntax Overview

Introduction to ASP.NET Web Pages

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