How to address dataset array column using variable

2012 1 7
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I need to retrieve values from dataset columns by addressing them using variables, e.g. dataset array:
DS =
C1 C2
10 20
11 21
To get the DS values for C1, I know I can address it by using
DS.C1
However, I need to address it through a variable, e.g.
Ref = 'C1'
Does anyone know of either a direct way or a work around to do so? Your help is very much appreciated!

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