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what is the purpose of "evaluateasexpression" in SSIS variables? I mean when I need to set it as TRU

Posted By:      Posted Date: September 12, 2010    Points: 0   Category :Sql Server
Friends, I have some SSIS package which is using variables. I built an expression for some purpose and I am using the following expressin in my ssis package. "_GROUP" + (DT_WSTR, 2) (((DT_I4 )(SUBSTRING( @[System::MachineName] , 12, 3 )) + 1)/2) + "_" The purpose of this is to get a group number basing on Machine name (taking the last two digits in the machine name) and dividing that number by 2. I am getting data conversion error if evaluateasexpression is set to TRUE. Can some tell me why? Thanks in advance.

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