how to add combobox(items from enum) to datagridview column?

[Earlyn Vassou]

the enum values of the combobox are day, hour, minute, second.

[MartijnHoekstra]

Have you tried to add a column being a:
DataGridViewCom boBoxColumn

Easy approach would be to click the little arrow on the top right side of the datagridview. Where you can use the Add Column feature. There select the type of the column you wish to add.