Databases of database tables do not have "cells" you can add. They have "record" or "rows" which you can add or remove. The notion of "cell" belong to the domain of UI controls. It can be an object of a grid, a (data) grid view, a list view (with) columns which (more or less loosely) used to represent database tables obtained as a result of queries.
[EDIT]
Basically, you need to use ADO.NET. For starters, I highly recommend this CodeProject article:
Using ADO.NET for beginners[
^].
Another article on Insert/Update/Delete with ADO.NET:
Simple ADO.NET Database Read, Insert, Update and Delete using C#.[
^].
I hope it will help you to get started.
—SA