How to Use Join Function TO display Multiple values of one Field in crystal Reports 2008

Question

I'm trying to Display the Multiple Values of One Database field ("{Customers.Name}"). I was tried to using Join function Like

Join({Customers.Name},","); 
or 
Stringvar array name:={Customers.Name};
for i :=1 to count(name)
(
join(name[i],",");
);![enter image description here][1]

These two codes not woriking because of following one error "String array Requried for Join function" Please Help Me to Solve this

Answer 1

It seems {Customers.Name} consist a string, foreach detail section gets values one by by one from XML. If You try to show all names comma separeted, you buld it in detail section, and show it in a group or page footer.

to do this, in group / page header initialize your variable:

Shared StringVar names := "";

in detail:

Shared StringVar names;
names := names & ", " & {Customers.Name};

in group / page footer in a print variable:

Shared StringVar names;
names