Why am I not getting .CopyToDataTable() in Linq Query()

Question

This following code example is borrowed from MSDN here. I am not getting query.CopyToDataTable() available in my code. (see the commented line in my following code).

Answer 1

It exists in a specific namespace are you importing it?

System.Data.DataTableExtensions.CopyToDataTable() 

Also confirm the addition of this reference

System.Data.DataSetExtensions