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Editorial Team
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Asked: 2026-05-13T11:09:58+00:00

I want to include certain files in my page. I’m not always sure if

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I want to include certain files in my page.
I’m not always sure if they exists, so I have to check if they do. (Otherwise the page crashes, as you probably know)

<%@ Page Language="C#" %> 

<html>
<body>
<% bool exists;
   exists = System.IO.File.Exists("/extra/file/test.txt");
%> 

Test include:<br>
<!--#include file="/extra/file/test.txt"-->

</body>
</html>

</html>

While the include works, the code checking if the file exists does not.

If I remove this code:

<% bool exists;
   exists = System.IO.File.Exists("/extra/file/test.txt");
%>

Everything runs fine.
I also tried putting it in a <script runat="server"> block, but it still failed.

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1 Answer

  1. Editorial Team

    Server side includes (SSI) are executed before your code, so you can’t do this way.

    If your included file is just static information (i.e. without server-side code), you can do something like:

    string file = Server.MapPath("~/extra/file/test.txt");
if(System.IO.File.Exists(file))
{
    Response.Write(System.IO.File.ReadAllText(file));
}
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