Populating the grid with data must be done with code. If you populate the grid in the Load event handler then the user will see that data when the form is displayed. You can add data directly to the grid or you can populate a DataTable or some other list and bind that to the grid.
If you're saying that you actually want multiple blank rows in the grid then you need to add those rows. The row you see by default is not actually part of the data of the grid. It's just there to indicate to the user that they can enter data.