Parent Variable Configuration - Passing Connection strings..

I have one parent package and a few child packages. I am using SQL Server 2008 R2.
I want to pass variables from Parent Package containing Connection String and other data to the child package. I created few variables in parent package e.g. ParentConnectionString & child package e.g. ChildConnectionString. I set the child package variables
using Package Configurations > Configuration Type = Parent package variable and map the ChildConnectionString value to ParentConnectionString.
I have put a script component that displays variables value set in the child package from parent package.
In child package i have a Connection of ConnectionManagerType = OLEDB. I have added an expression to set the ConnectionString using the ChildConnectionString.
When i run the parent package during the validation phase, it calls the child package. The script component displays the values are being set in child package from parent package but after that it fails saying  - invalid username/password; logon denied.
I suspect that the connectionstring expression are going to be executed at run time and not at validation time.
If i put the complete connection string in ChildConnectionString it works fine.
I am not sure if i am doing anything wrong?

It could be that you simply need to put the DelayValidation property to True.
Thing is, when the package starts it validates itself; but at this time the design time connection string property is used, whereas the "real" conn string has been designed to come at a later - runtime, hence you need to set the DelayValidation to true to
make the package not checking the connectivity in advance, and thus successfully start.
Arthur My Blog

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