ASP.NET Expression Builders

http://weblogs.asp.net/infinitiesloop/archive/2006/08/09/The-CodeExpressionBuilder.aspx

[ExpressionPrefix("Code")]

public class CodeExpressionBuilder : ExpressionBuilder {

    public override CodeExpression GetCodeExpression(BoundPropertyEntry entry, 

       object parsedData, ExpressionBuilderContext context) {

        return new CodeSnippetExpression(entry.Expression);

    }

}

<compilation debug="true">

  <expressionBuilders>

    <add expressionPrefix="Code" type="Infinity.Web.Compilation.CodeExpressionBuilder"/>

  </expressionBuilders>

</compilation>

And to see it in action:

<asp:CheckBox id="chk1" runat="server" Text="<%$ Code: DateTime.Now %>" />