The for statement you see here is the C-style for statement, so its translation to C should be fairly trivial (please note that I don't program C, I only know how to read it - I'm not sure with the pointer syntax, as on which side the asterisk goes when, and I don't know whether C '99 introduced the arrow syntax for dereferencing...):

int *L; /* Aaah, C, the language where an int is a pointer and a point
+er is an int */
int *m;
for (L = *tabs[10]; L; L = L*) {
  *m[ *L[1] ] = *L[2];
};

/* But I think this should be clearer : */
int *L; /* Aaah, C, the language where an int is a pointer and a point
+er is an int */
int *m;
for (L = *tabs[10]; L; L = L*) {
  int index = *L[1];
  int value = *L[2];
  *m[ index ] = value;
};
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perl -MHTTP::Daemon -MHTTP::Response -MLWP::Simple -e ' ;    # The  
$d = new HTTP::Daemon and fork and getprint $d->url and exit;#spider
($c = $d->accept())->get_request(); $c->send_response( new   #in the
HTTP::Response(200,$_,$_,qq(Just another Perl hacker\n))); ' #  web
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for (temp = head;
     temp;
     temp = temp->next)
{
    // Do stuff here with temp
}
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For-loops only going from 0->N is actually a common, but limited subset of the for-loop. Remember, for-loops and while-loops are interchangeable. The above for-loop would be written as a while-loop as such:

temp = head;
while (temp)
{
    // Do stuff here with temp
    temp = temp->next;
}
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I could turn it into a while statement for you, maybe that helps:

my $L = $tabs->[10];
while ($L)                         # ie, as long as $L has a value
{
   $m->[ $L->[1] ] = $L->[2];      # assign the 3rd value referenced b
+y $L to the arrayref $m 
                                   # (indexing with the 2nd value refe
+renced by $L)
   $L = $L->[0];                   # assign $L the first value of the 
+arrayref its referencing 
                                   # (or undef if not available)
}
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C.

I believe you CAN do references in c#, so that is probably the way to go.

Since this is a perl forum, we will leave you the exercise of figuring out the c# code.