editing and updating data in datagridview with Windows Forms Application

Question

I have added a datasource and a datagridview in a windows forms application. I am able to view the data from my database on to the grid, however when i try to insert new row (by clicking on the empty row) or try to edit the existing data it doesn't reflect in my database. I remember we do not have to add any manual code to achieve such a thing. I'm not in asp.net but using Windows Forms Application. Any help?