ho risolto cosi e funziona
codice:
A = Array(1,2,3,4,5)
B = Array(2,5,7,8,9,10)
C = Array(2,5,10,11,12,13,14)

for i=0 to Ubound(A) 
		for ii=0 to Ubound(B) 
			if A(i)=B(ii) then
			
					for iii=0 to Ubound(C) 
						if B(ii)=C(iii) then
							Response.Write(C(iii)) 
						else
							Response.Write("no") 	
						end if
					next
					
			end if
		next
	
next




ma se popolo l'array da una stringa non funziona, dove è il problema??




codice:
conta_uno= "1,2,3,4,5"
conta_due= "2,5,7,8,9,10"
conta_tre= "2,5,10,11,12,13,14"

A = Array(conta_uno)
B = Array(conta_due)
C = Array(conta_tre)


for i=0 to Ubound(A) 
		for ii=0 to Ubound(B) 
			if A(i)=B(ii) then
			
					for iii=0 to Ubound(C) 
						if B(ii)=C(iii) then
							Response.Write(C(iii)) 
						else
							Response.Write("no") 	
						end if
					next
					
			end if
		next
	
next