How do I indicate that a column in a data table has been added or changed?

1. How can you identify a column in a DataTable?
2. How do I add a column to a DataTable?

How can you identify a column in a DataTable?

DataTables stores each column internally with a column index for fast look up of column information. When the selector is given as an integer, this value represents a column data index ( columns(). indexes() / column(). index() ).

How do I add a column to a DataTable?

You create DataColumn objects within a table by using the DataColumn constructor, or by calling the Add method of the Columns property of the table, which is a DataColumnCollection. The Add method accepts optional ColumnName, DataType, and Expression arguments and creates a new DataColumn as a member of the collection.