switch (err)
{
    case Interop.ApplicationManager.ErrorCode.InvalidParameter:
        throw new ArgumentException("Invalid Parameter.");
    case Interop.ApplicationManager.ErrorCode.NoSuchApp:
        throw new InvalidOperationException("No such application.");
    case Interop.ApplicationManager.ErrorCode.OutOfMemory:
        throw new OutOfMemoryException("Out of memory");
    default:
        throw new InvalidOperationException("Invalid Operation.");
}

throw MapContextError(err);

private static Exception MapContextError(Interop.ApplicationManager.ErrorCode err) => err switch
{
    Interop.ApplicationManager.ErrorCode.InvalidParameter => new ArgumentException("Invalid Parameter."),
    Interop.ApplicationManager.ErrorCode.NoSuchApp        => new InvalidOperationException("No such application."),
    Interop.ApplicationManager.ErrorCode.OutOfMemory      => new OutOfMemoryException("Out of memory"),
    Interop.ApplicationManager.ErrorCode.PermissionDenied => new UnauthorizedAccessException("Permission denied."),
    _                                                      => new InvalidOperationException("Invalid Operation."),
};