Continuing from my last post on variable basics ,you can click here to view MSBI # 10 - SSIS # 3 - Familiar with SSIS Variables from 0 to Expert (Part - I - Introduction) - Vishal Pawar's Blog
And then on for System Variable MSBI # 11 SSIS # 4 Familiar with SSIS Variables from 0 to Expert (Part II - System Variable) - Vishal Pawar's Blog
Where SSIS Variables are used
For more Details on above usage Click Here
How to: Set the Properties of a Variable
The Variables window.
The Properties window. The Properties window lists properties for configuring variables that are not available in the Variables window: Description, EvaluateAsExpression, Expression, ReadOnly, and ValueType.
If you use Scripting tasks, the CLR or build components for SSIS, you will need to convert values from their SSIS types into .Net types. Here's a quick list of the SSIS data types and their .Net companion.
For more Details on SSIS variable you can visit following link
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Hope this helps !!
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