SSRS 2012 csv export - dynamic column header name - reporting-services

Question

I need to export my SSRS report to csv format. Issue I am facing is that few column header names change with country code (parameter) and I want to show the same name in my exported csv. I have gone through other related questions and topic, specifically this one. It suggested that there is a work around by setting data value to null. I have tried this by adding columns and hiding these based on country code, along with setting data value to null for that dataset field. But it did not work. I still get the hidden column in my export, with no values in it.
Can someone confirm that this workaround works or is there any other way apart from creating different reports for each country?
UPDATE: (added report screenshot and description for clarification)
Based on apporoach I have taken,
I need to only show Column 'Town' for Country A and only 'Suburb' for Country B. This is easily done by hiding columns based on Country Parameter( and works fine for EXCEL export), but when exported to CSV, both columns are exported.
UPDATE 2
Found this link which is similar to what I have been trying to figure out and looks like there is no solution which can be achieved using only one report.

Answer 1

According to this post
MSDN Social: Hide CSV columns conditionally in SSRS report
The XML and CSV renderers use the DataElementOutput property to
control visibility. We can select which item we want to hide in the
report, and set the “DataElementOutput” property with value “NoOutput”
to work around the issue.
Alternatively, we can add below expression to control the item’s
visibility. Please refer to the expression below:
=IIF(Globals!RenderFormat.Name="CSV",True,False)
This, incidentally, is the second answer in the thread that you posted. That answer links to the following article which explains how to do exactly what you need
Hide/Show Items Dependant On Export Format
UPDATE
It appears that you cannot programmatically set DataElementOutput for CSVs. However, according to this post SSRS - Programatically controlling the DataElementOutput property
in RS 2005 / 2008, you should be able to get the desired effect by adding a filter on the tablix directly (in addition to the visibility condition):
Filter expression: =(Parameters!DataPeriod.Value = "DAY")
Filter operator:    =
Filter value:     =true
Thereby, for the cases where the tablix is not visible, you are also filtering out all the data.
You may be able to show/hide country specific columns this way instead.

Answer 2

My approach would be to do this in SQL. I'm not sure how you determine which Countries require the town to be returned and which require the suburb to be returned but here's a couple of approaches that hopefully cover your scenario.
In either case, the idea is to return the town/suburb data in the same column and then an additional column that will contain a a caption that we can use as the column header.
a. Only one of either the town or suburb column in your table is populated. In this case it's pretty simple.
SELECT
Country
, ISNULL(TownOrCity, StreetSuburb) AS TownSuburb
, CASE WHEN TownOrCity IS NULL THEN 'Street-Suburb' ELSE 'Town-City' END AS Caption
FROM myTable
b. You know upfront which Countries require what and you can pass a parameter in to get the correct column. In this example we'll use a parameter called #TS and pass in either a T or and S
SELECT
Country
, CASE #TS WHEN 'T' THEN TownOrCity ELSE StreetSuburb END as TownSuburb
, CASE #TS WHEN 'T' THEN 'Town-City' ELSE 'Street-Suburb' END AS Caption
FROM myTable
Whichever approach we take you will end up with a simple table
Country TownSuburb Caption
Testland TownA Town
Testland TownB Town
Testland TownC Town
In you report, you don;t need to do anything except make the town/suburb column caption an expression something like =FIRST(Fields!Caption.Value)
That's it, the report is now nice and simple and should export without any issues.
UPDATE to method:
--
-- Dump data into a temp table
--
SELECT
Country
, CASE #TS WHEN 'T' THEN TownOrCity ELSE StreetSuburb END as TownSuburb
INTO #t
FROM myTable
--
--rename the column
--
DECLARE #NewColumnname sysname = CASE #TS WHEN 'T' THEN N'Town-City' ELSE N'Street-Suburb' END
EXECUTE tempdb..sp_rename N'tempdb..#t.[TownSuburb]', #NewColumnname, 'COLUMN'
--
-- finally get the result
--
SELECT * FROM #t