How To Access Each Row In A DataGridView

I have a DataGridView, and I want to fill in some values in some fields automatically, ie, the form should enter those values by itself when a new row is added. To read the values from a row in the DataGridView, I was using the snippet below:[code]However, I can't use that method to write values. I would have used an update statement, but I actually cant use an update here, because I wanna fill in a few columns of the DataGrid, while leaving the rest for the user to fill in.Better still, is there some way to directly enter the values for a few columns in the bindingsource, and display only a few columns to be entered in the DataGridView? Basically, I have a PatientID field which must be entered automatically by the form, so I wanna leave this column out of the grid to save space. Meanwhile, the other columns, namely DrugID and Quantity must be displayed in the Grid, and the user must be allowed to edit them.