Perl to C#. Help me please!

#!/usr/bin/perl
#
# $URL: svn://domestic/54/doc/inf/perl-problems/examples/perl/find.pl $
# $Id: find.pl 516 2010-11-28 18:31:09Z  $
#
use warnings;

sub find($);
sub find($)
{
	my $name=shift;
	if(-d $name)
	{
		my $dir;
		unless(opendir $dir, $name)
		{
			warn "$0: Impossible to open «$name»: $!\n";
			return;
		}
		print "$name\n";
		$name='' if $name eq '/';
		for(readdir $dir)
		{
			next if $_ eq '.' or $_ eq '..';
			find("$name/$_");
		}
		closedir $dir;
	}
	elsif(-f $name)
	{
		print "$name\n";
	}
	else
	{
		warn "$0: «$name»: $!\n";
	}
}

find($_) for @ARGV;
find('.') unless @ARGV;