Why doesn't binding expression work with C# expressions?

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The following code compiles, but doesn\'t work. As far as I know data-binding expressions allow any valid C# code in them. So what am I doing wrong here?


                      
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                  清酒与你        
                
              
                            
                2021-02-11 10:22
              
            
            
                                                                       
Try this:

<html>
<head runat="server">
    <title></title>
    <script runat="server">
        protected void 
            Page_Load(object sender, EventArgs e)
        {
            this.myPannel.DataBind();
        }
    </script>
</head>
<body>
    <form id="form1" runat="server">
        <asp:Panel CssClass='<%# ("my-class") %>' 
            runat="server" 
            ID="myPannel">
            Blah
        </asp:Panel>
    </form>
</body>
</html>


Or just switch the order of your inline code snippets:

<body>
    <% this.myPannel.DataBind(); %>
    <form id="form1" runat="server">
        <asp:Panel CssClass='<%# ("my-class") %>'
            runat="server"
            ID="myPannel">
            Blah
        </asp:Panel>
    </form>
</body>


Or simply use:

<% this.myPannel.CssClass = "my-class";%>
<form id="form1" runat="server">
    <asp:Panel
        runat="server"
        ID="myPannel">
        Blah
    </asp:Panel>
</form>


In all three cases, you have to make sure that the control property is updated before the actual inline code of the control is being processed in the page's life cycle.
                                                                        
                                                        
            
            
              
                
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