SSRS 2008 - hide chart lines based on parameter selected

Question

How to control visibility of chart lines based on Params selected by user?
By default, my report display last 3 years worth of data (including current) with Month on the x axis and Counts on the y axis. I have two Boolean parameters:
TwoYrs? T/F
ThreeYrs? T/F
if False is selected for TwoYr and ThreeYr parameters then I want to hide chart lines corresponding to last year and the year before.
What I've tried: Created 3 Series groups with filters. eg. YearSeries1 to return only current year data and applying an expression to display it if params TwoYrs and ThreeYrs = False. and so on for YearSeries2 to return current + last
years data if param TwoYrs is True and ThreeYrs = False.  But I don't see where to add expression to control the display of the individual series groups.  I am open to any way of doing this, but this seemed most logical.

Answer 1

Hi Ok-Hee,
In your Source Query just need to filter the series data based on the Parameters.
I have written sample query below:-
select * from
select 1 monthnumber , 'Jan' MonthName, 2013 year,100 amount
union
select 1 monthnumber , 'Jan' MonthName, 2014 year ,200 amount
union
select 1 monthnumber , 'Jan' MonthName, 2015 year , 300 amount
union
select 2 monthnumber , 'Feb' MonthName, 2013 year, 300 amount
union
select 2 monthnumber , 'Feb' MonthName, 2014 year, 350 amount
union
select 2 monthnumber , 'Feb' MonthName, 2015 year,200 amount
union
select 3 monthnumber , 'Mar' MonthName, 2013 year, 380 amount
union
select 3 monthnumber , 'Mar' MonthName, 2014 year, 100 amount
union
select 3 monthnumber , 'Mar' MonthName, 2015 year, 500 amount
)t
where year in (
select distinct FilterYear from
select case when @TwoYrs=1 then year(getdate())-1 else year(getdate()) end FilterYear
union
select case when @TwoYrs=1 and @ThreeYrs =1 then year(getdate())-2 else year(getdate()) end FilterYear
union
select year(getdate()) FilterYear
) t
I have created one post in my blog , you can check the result.
https://msbitips.wordpress.com/2015/03/12/ssrs-2008-hide-chart-lines-based-on-parameter-selected/
Thanks
Prasad