I have one Datatable like

DataTable addressAndPhones;

And there are four columns name,address,phoneno,and other details and I only want two columns Name and address from that so I do for that is

DataTable addressAndPhones2;
addressAndPhones2.Columns.Add(new DataColumn(addressAndPhones.Columns["name"].ColumnName));
addressAndPhones2.Columns.Add(new DataColumn(addressAndPhones.Columns["address"].ColumnName));

But it gives me error so how can I copy fix no of columns data from one table to another table ?

ERROR :Object reference not set to an instance of an object.

EDIT : Only column is copied to another table, data of that column is not copied to another table.