AcquireConnection method - DSN contains an architecture mismatch between the Driver and Application

I am building a package programatically by loading an existing SSIS package (application.LoadPackage(...).  In the package that I am loading, I have set the project properties for Run64BitRunTime to false.  If I run this package by itself, it works just fine.  As the new package is building, the DataSource AcquireConnection method is called.  I then receive the error:  {"ERROR [IM014] [Microsoft][ODBC Driver Manager] The specified DSN contains an architecture mismatch between the Driver and Application"}.  What is the appropriate setting for the C# project that builds the package.  Thanks.