I have a .NET application written in C# that saves information in XML format. The application serializes the application data into xml. The application contains a textbox where the user is free to enter any text. I have cases where users have managed to enter characters, mostly when they copy and paste text from other applications into the textbox, where the xml document becomes corrupted. Is there a general approach to manage illegal characters in xml documents without having to filter them out in every textbox on entry.

Sample from document thats corrupted

```
<Propery>
  <Name>&#x8;Alimentação Controlador</Name>
  <Value>24</Value>
  <Unit>Vca</Unit>
</Propery>

```

Document is serialized with ASCIIEncoding.UTF8