SSIS: Dynamic Lookup Query

I would like to implement the following logic to my Lookup query as an expression:

        CASE @[User::ConnectionStringID]
        WHEN 1 THEN "NE"
        WHEN 2 THEN "BALT"
        WHEN 3 THEN "NY" 
        WHEN 4 THEN "PA"
        END AS Region
FROM    dbo.Table;

My package is executed in a loop where the connection string is dynamically updated using a config file and it loops 4 times as shown in the above logic.

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    One Solution collect form web for “SSIS: Dynamic Lookup Query”

    Lookup control has expressions, but cannot accessed directly from it just go to your Dataflowtask properties and access the expressions like shown in the image below

    enter image description here

    MS SQL Server is a Microsoft SQL Database product, include sql server standard, sql server management studio, sql server express and so on.