Create key with more than one file and delete all at once

Can I create in the app.config, a key pointing to multiple directories and in the code pointing to that key and deleting all directories at once? Each directory should be separated by ";"? Like this:

<add key="Dir_BD" value="C:\Teste_Zip\Destino_Teste\Temp\bd;C:\Teste_Zip\Destino_Teste\Temp\Exe;C:\Teste_Zip\Destino_Teste\Temp\js"/>