Retrieve unique column values from a datatable

This blog explains how to retrieve unique column values from the given System.datatable.

For example assume that the datatable contains the values as follows:

Now when you want to retrieve the unique values of Col3, then it can be achieved as follows.

This code returns the unique column values of the "Col3". Thus the datatable dt2 contains the unique values of  column "Col3" from the dt table.