Hi,
Thanks for the fast reply ! But sadly this not solve my problem. I give you my GridView “Code” to explain better 
Rubriques, Taux salarial,Taux Patronal,Soumis CSG,Taux soumis CSG
,2015,2016,2015,2016
AGFF /A,0.800,<à remplir>,1.200,<à remplir>,[x],0.850
AGFF /B,0.900,<à remplir>,1.300,<à remplir>,[]
{2L,1C,1C,1C,1C,0C,1C}
Values 2015 and 2016 have to be under “Taux Salarial” AND “Taux Patronal” (Excuse my French
) in two separate column. It’s like making a HTML Table with a rowspan=2 for Taux Salarial and Taux Patronal