How Can i remove duplicate row if two columns values are matched

Suppose There are 3 columns in csv file (Name, Age, PhoneNo),
Name Age PhoneNo
A 10 1234567890
B 23 22333445666
A 20 1234567890

Here If the Name and PhoneNo are same then I want to remove one record.

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dt.DefaultView.ToTable(true, new String(){"Name","Age"})

Actually It will remove PhoneNo column. I want something like:
Name Age PhoneNo
A 10 1234567890
B 23 22333445666