Script Component - variables locked for read and write not available outside of post execute

Question

Hello,
I have two Data flow task,
Frist one has OLE DB Source and Script Component as Transformation
I have package level variable called AllSiteIds
In first DFT, i have a local varibale that is declared before PreExecute method and after ScriptMain:UserComponent line.
This local variable is used in Input process method to concatenate the one of the row values like below
SiteId = SiteId + Row.SID.ToString()+",";
The package level variable AllSiteIds is set for ReadWrite on script component.
In my post execute i am setting package level variable AllSiteIds
Variables.AllSiteIds = SiteId;
In my second DFT, i have OLEDB source and Script transformation and i am accessing the package level variable AllSiteIds in Preexcute but not able to do so and getting error mentioned in subject.
My goal is to create string of all SiteIds delimited by comma and have it available in second DFT to be used in Preexcute.
The sql command i am using to get all unique siteid's is
Select SiteId from dbo.Services
Group By SiteId
Order By SiteId
Using the result from above i need to create comma delimited string of all site ids' and store it in variable so i can use it in pre excute of second DFT.
Please suggest on how to accomplish above?

Answer 1

If all you want is to generate a string of ids then you can simply use a Execute sql task for this and use a query based on FOR XML PATH which will generate the string of ids
http://visakhm.blogspot.in/2014/01/rowset-concatenation-with-special.html
then inside execute sql task set resultset option as single row and store the result ina SSIS varaiable of type string.
Once this is done you can then use this variable inside the subsequent data flow task 
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