hexadecimal value 0x00 is an invalid character, web site crashed when upgraded to .NET 3.5

Issue:

When we upgraded to Microsoft .NET Framework 3.5, some websites crashed. Here are error messages.

Description: An error occurred during the parsing of a resource required to service this request.   
    Please review the following specific parse error details and modify your source file appropriately.
Parser Error Message: '.', hexadecimal value 0x00, is an invalid character. Line 2, position 1.
Source Error:
Line 1: <?xml version="1.0" encoding="utf-8"?>
Line 2: <xs:schema id="DataSetAdmin"
Line 3: <xs:annotation>
Line 4: <xs:appinfo source="urn:schemas-microsoft-com:xml-msdatasource">
 
Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

 

Solution:

>Please remove the encoding attribute from your xml document.

From

<?xml version="1.0" encoding="utf-8"?>

to

<?xml version="1.0"?>
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