C＃Datagridview Checkbox Checked Event - 多行？

I have a datagridview with multiple columns and rows. The first column contains a checkbox. I want the user to be able to select multiple checkboxes and then perform an action. For example if they select checkboxes in rows 1 and 2, the data from other columns in rows 1 and 2 can be selected and passed into a messagebox.I have a datagridview with multiple columns and