1If you are having trouble adding the reference
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3"Microsoft.DataTransformationServices.Controls"
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5You have to go to the following folder to add the reference,
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7"C:\WINDOWS\assembly\GAC_MSIL\"
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9And then navigate to said dll
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11i.e. For me the path was:
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13C:\WINDOWS\assembly\GAC_MSIL\Microsoft.DataTransformationServices.Controls\9.0.242.0__89845dcd8080cc91\Microsoft.DataTransformationServices.Controls.DLL