hexadecimal value 0x0B, is an invalid character issue in XML - asp.net

Question

I am getting exception
'', hexadecimal value 0x0B, is an invalid character. Line 23, position 22.
I have already tried solution from Here, but it is not working for me. As my project is in 3.5 version, I cannot use XmlConvert.IsXmlChar method MSDN
How to handle it ?

Answer 1

You can replace these invalid characters using the below method.
public static string CleanInvalidXmlChars(this string StrInput)
{
//Returns same value if the value is empty.
if (string.IsNullOrWhiteSpace(StrInput))
{
return StrInput;
}
// From xml spec valid chars:
// #x9 | #xA | #xD | [#x20-#xD7FF] | [#xE000-#xFFFD] | [#x10000-#x10FFFF]
// any Unicode character, excluding the surrogate blocks, FFFE, and FFFF.
string RegularExp = #"[^\x09\x0A\x0D\x20-\xD7FF\xE000-\xFFFD\x10000-x10FFFF]";
return Regex.Replace(StrInput, RegularExp, String.Empty);
}

Answer 2

If you don't want to remove the vertical tab (hexadecimal value 0x0B) from the string (e.g. database export), you can also set CheckCharacters to false in your XmlWriterSettings.
Gets or sets a value that indicates whether the XML writer should
check to ensure that all characters in the document conform to the
"2.2 Characters" section of the W3C XML 1.0 Recommendation. Returns:
true to do character checking; otherwise, false. The default is true.
e.g.
private static System.Xml.XmlWriter CreateXmlWriter(System.IO.Stream stream)
{
System.Xml.XmlWriterSettings xs = new System.Xml.XmlWriterSettings();
xs.Indent = true;
xs.IndentChars = " ";
xs.NewLineChars = System.Environment.NewLine;
xs.OmitXmlDeclaration = false; // // <?xml version="1.0" encoding="UTF-8" standalone="yes"?>
// xs.Encoding = System.Text.Encoding.UTF8; // doesn't work with pgsql
// xs.Encoding = new System.Text.UTF8Encoding(false);
xs.Encoding = new System.Text.UTF8Encoding(false, false);
xs.Async = true;
xs.CheckCharacters = false;
return System.Xml.XmlWriter.Create(stream, xs);
} // End Function CreateXmlWriter