Need Grouping according to parameters !!!

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C#

NHibernate

Hi everyone, I've a report and I need to group that report according to parameters that I'm gonna pass it from my code. need help for my project !

for exp,

[Purchase] [Supplier]
[Group]
[c1]
[c2]

[Purchase] [Supplier]
[Group]
[c1]
[c2]

in that report, [Group] parameter is the variable that I wanna group my rdlc.
I need to pass parameters according to user's desire..

where i can change to pass parameters and group ??

thanks a lot !
Doyle Raymond