ClaimPrincipal Read Group list into string

I have this code:

 var claim = cp.FindFirst(ClaimGroup);

This will give me one group (works fine). The first one. But some people have more than 1 group. I need all the groups to be in 1 string/var

I tried something with foreach and FindAll .. but i can't figure it out. Can someone help?
A. AmienAsked:
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AndyAinscowFreelance programmer / ConsultantCommented:
Assuming you mean ClaimsPrincipal (not ClaimPrincipal as in your question title) then the FindFirst returns a Claim object.  
What do you expect when you pack more than one Claim into a string ?

ps.  something like the following should work
string s;
foreach(Claim c in cp.FindAll(ClaimGroup))
{
  s +=   //now do something with the returned Claim object to append it to the string
}
0

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