Selecting data in a DataGridView with shift+mouse click is very slow as soon as there are some more rows. Also programmatically selecting cells by DataGridView1[col, row].Selected = true is very slow, about 1 second for every 100 cell selected. I'm working with datasets with 5000-20000 rows, and I need to be able to select cells for copy/paste operations.
Is there some way to speed up the selection method?
And if not, how can I prevent selection from happening when the user uses shift + mouse click? As this will freeze the program for several minutes if the user tries to do a large selection.
