Where is the most conventional/best place to add actions for items inside datatable?

1. How do I add data to a DataTable?
2. How to add a row to a DataTable in C#?

How do I add data to a DataTable?

New rows can be added to a DataTable very easily using the row. add()DT API method. Simply call the API function with the data that is to be used for the new row (be it an array or object). Multiple rows can be added using the rows.

How to add a row to a DataTable in C#?

To add a new row, declare a new variable as type DataRow. A new DataRow object is returned when you call the NewRow method. The DataTable then creates the DataRow object based on the structure of the table, as defined by the DataColumnCollection.