Report parameter variable in SSRS 2008 R2

We can use custom code in SSRS. Refer this link,

http://blogs.msdn.com/b/robertbruckner/archive/2008/07/21/using-group-variables-in-reporting-services-2008-for-custom-aggregation.aspx

http://social.msdn.microsoft.com/Forums/sqlserver/en-US/2c0428ef-c449-42d4-90f8-45cb2b71eb55/how-to-create-report-variables-in-ssrs-2008

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Regards, RSingh