[C#]Unable to translate Unicode character \\u010B at index 53 to specified code page.

[Kendo]

I have this strange message when I try to save XML-file with XmlWriter:

"Unable to translate Unicode character \\u2009 at index 478 to specified code page."

Why it's strange?
Because when the file is small (< 1KB) there is no problem and the file it's saved correctly but if file it's big (> 500KB) I get this message?
Can sombody help me?
snippet:

string strFile = @"c:\tmp\test.xml";
XmlWriter _xmlWriter;
XmlWriterSettings settings = new XmlWriterSettings();
settings.Encoding = Encoding.Default;
_xmlWriter = XmlWriter.Create(strFile, settings);
xmlDoc.Save(_xmlWriter);
_xmlWriter.Close();

[Plater]

Is it because there is not a translation from those unicode characters to whatever the default encoding is?

[Kendo]

Thank you :-)

Yes, you're right. The Unicode character (\u010B) have no translation in default encoding (ISO-8859-1).

But then the strange situation is when I have small file.

I made xml file:
<?xml version="1.0" encoding="UTF-8"?>
<root>
<text>textul: <chr>ċ</chr><dec>267</dec><hex>10B</hex><dec1>99</dec1></text>
</root>

where:
<chr>-tag is Unicode character \u010B
<dec>-tag is decimal code of character \u010B
<hex>-tag is hexadecimal code of character \u010B

this file it's save with the Unicode character translated to entity &#x010B;
<?xml version="1.0" encoding="ISO-8859-1"?>
<root>
<text>textul: <chr>&#x010B;</chr><dec>267</dec><hex>10B</hex><dec1>99</dec1></text>
</root>

And when the file have exactly 79 more same <text> nodes :) I get the "ugly" message from thread subject :).

What I do wrong? :-)

Thanks in advance

[Kendo]

well, I found how to :)
here it is the answer: stackoverflow.com

    XmlDocument doc = new XmlDocument();
    doc.LoadXml(@"<xml>™</xml>");
    using (MemoryStream ms = new MemoryStream())
    {
        XmlWriterSettings settings = new  XmlWriterSettings();
        settings.Encoding = Encoding.GetEncoding("ISO-8859-1");
        XmlWriter xw = XmlWriter.Create(ms, settings);
        doc.Save(xw);
        xw.Close();
        Console.WriteLine(Encoding.UTF8.GetString(ms.ToArray()));
    }