Answer 1

dataGridView1.Rows.Remove(item);

I am not sure which code you already have and what parth of that code is not working. Please make sure that if a rows is delete also the datasource behind the grid is updated.

Have a look at the links below

https://www.c-sharpcorner.com/forums/delete-rows-in-datagridview-in-c-sharp

https://stackoverflow.com/questions/2084346/how-to-delete-a-selected-datagridviewrow-and-update-a-connected-database-table

http://csharp.net-informations.com/datagridview/deletegridview.htmq