Error in app.config

Question

I'm getting following error in app.config on compilation in Visual Studio. How do I resolve such errors, please?

Character ' ', hexadecimal value 0x13 is illegal in XML documents.

Answer 1

0x13 is a control character (XOFF)(Device Control 3) that is not printable. ASCII Table .

Try to open the XML in a good text editor, eg Notepad++ . Notepad++ has the option to show all characters, even not printable ones (View -> Show Symbol -> Show All Characters).

Then find and delete the offending character.