SSRS Reporting - Report takes 16min to render... too many expressions

Question

Hi,
I'm new to this whole SSRS business... and I'm running into two major issues while trying to create my first report...
#1 I know there is a probably better ways to do what I'm trying to accomplish
#2 It takes 16 min to run
Problem: I need to get a count of "cards" that were active/deactivated during a given (user selected) accounting month (broke down by day) - One of my problems is that from the (DataSet1 - which contains must of the info I need) only contains the
start and end date of the accounting month ( I don't have a calendar table)
So (From the screenshot) (column 1 "ACM START DT Short" I'm manually adding expressions (29) to get the dates I need..
link to screenshot :
https://drive.google.com/file/d/0B6xIAvBds7UuZ0VFdld1UlV5emc/edit?usp=sharing
Since I only have start and end date I'm using these properties on my first and last row and for the rest I'm using the following expression (increasing the day by 1)
=Fields!CUBD_CareDay_Period_End_DT_SHORT.Value
=DateAdd(DateInterval.Day,1,Fields!CUBD_CareDay_Period_Start_DT_SHORT.Value)
=DateAdd(DateInterval.Day,2,Fields!CUBD_CareDay_Period_Start_DT_SHORT.Value)
=DateAdd(DateInterval.Day,3,Fields!CUBD_CareDay_Period_Start_DT_SHORT.Value)
=DateAdd(DateInterval.Day,29,Fields!CUBD_CareDay_Period_Start_DT_SHORT.Value)
=Fields!CUBD_CareDay_Period_End_DT_SHORT.Value
I find this really dumb and I'm sure there are better ways to do this...
Is there a way (for instance) to write some code to do something like (see below) and dump the result (dates) into my first column
  /what I mean with start_date + 1 is to increase the start_date by one day
i=1
If (start_date + i) < end_date
i++
then return start_date+1
else return end_date
is it possible? If so, how? any articles that may help?

Answer 1

I don't think that I would approach this problem with vb, because it is going to do a lot of extra processing no matter how you cut it.  
I would try to get clever in your select statement of the dataset for the table that you are trying to populate.  Instead of creating large SSRS table with a calculation in each row, create a single row table (plus header) and let the dataset define
the date for each row.  
You might even hack together a small date table in a CTE just to force the query to have dates to join to.
;with dates as (
select DateAdd(day, Row_Number() over (order by (select 1)), getdate()) as someDate
from sys.columns
Select top 30 * from dates
If you want more detailed help, show your query.
Mark