This exception is thrown if you attempt to access a directory that does not exist.

public class DirectoryNotFoundException : IOException {
// Public Constructors
   public DirectoryNotFoundException( );
   public DirectoryNotFoundException(string message);
   public DirectoryNotFoundException(string message, Exception innerException);
// Protected Constructors
   protected DirectoryNotFoundException(System.Runtime.Serialization.SerializationInfo info,
       System.Runtime.Serialization.StreamingContext context);
}

Hierarchy

System.Object System.Exception(System.Runtime.Serialization.ISerializable) System.SystemException IOException DirectoryNotFoundException