You can get the selected cells, rows, or columns from a xref:System.Windows.Forms.DataGridView control by using the corresponding properties: xref:System.Windows ...
If you have special performance needs, you can implement virtual mode and provide your own data management operations. For more information, see Data Display Modes in the Windows Forms DataGridView ...
If you're using the Windows Forms DataGridView and loading data into columns by pulling that data out of properties on objects, you should know that there's an easier way. Just create a List of your ...