Response.WriteFile("mymenu.aspx") Bug?

Question

I'm using Response.WriteFile("mymenu.aspx") to write a plain text file out to an area in a MasterPage. Unfortunately it's also printing out an unknown character represented by the square character. The contents of the menu file are as followings:

<ul>
  <li><a href="Accounts">Accounts</a></li>
</ul>

The square character is what is causing my menu to display incorrectly, pushing it down about 20 pixels. I tested putting just the HTML in the master page instead of including the file and it works fine which mean it must be down to the Response.WriteFile function. I don't suppose anyone else has encountered this problem?

EDIT: I tried the following as well, just to really make sure I wasn't doing anything stupid and that the file didn't contain anything dodgy.

<%
   Dim tw As New System.IO.StreamReader(Server.MapPath("menu.aspx"))
   For Each s As String In tw.ReadToEnd
      Response.Write(s)
   Next
%>

It worked. But that still doesn't explain Response.WriteFile behaviour.

Answer 1

This sounds like a character encoding issue. Is this file in the same encoding as the page your using it from?

Edit

Open the file up in a hex editor make sure there are no weird characters in there.

Answer 2

Have a look at your text file in an editor that will show all characters including carriage returns, line feeds etc. (Notepad++ is my choice). File may have an unusual eof marker or other encoding issue from the software that created the file.

Answer 3

I tested your code and it rendered correctly for me.

I have seen ASP.NET alter incoming XML strings in WebMethods before. Save the text to a file on disk before you Response.Write it to compare. Check your CSS for your LI style.