If statement in aspx page

if the purpose is to show or hide a part of the page then you can do the following things

1) wrap it in markup with

<% if(somecondition) { %>
   some html
<% } %>

2) Wrap the parts in a Panel control and in codebehind use the if statement to set the Visible property of the Panel.

Just use simple code

<%
if(condition)
{%>

html code

<% } 
else 
{
%>
html code
<% } %>

Normally you'd just stick the code in Page_Load in your .aspx page's code-behind.

if (someVar) {
    Item1.Visible = true;
    Item2.Visible = false;
} else {
    Item1.Visible = false;
    Item2.Visible = true;
}

This assumes you've got Item1 and Item2 laid out on the page already.

A complete answer for optional content in the header of a VB.NET aspx page using a master page:

 <%@ Page Language="vb" AutoEventWireup="false" MasterPageFile="~/Site.Master" CodeBehind="some_vb_page.aspx.vb" Inherits="some_vb_page" %> 
 <asp:Content ID="Content1" ContentPlaceHolderID="head" Runat="Server">          
     <% If Request.QueryString("id_query_param") = 123 Then 'Add some VB comment here, 
         'which will not be visible in the rendered source code of the aspx page later %>        
         <!-- add some html content depending on -->
         <!-- the condition in the if statement: -->                
         <script src="http://ajax.googleapis.com/ajax/libs/jquery/1.8/jquery.min.js" type="text/javascript" charset="utf-8"></script>
     <% End If %>
</asp:Content>

Where your current page url is something like:

http://mywebpage.com/some_vb_page.aspx?id_query_param=123

If statement in aspx page

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