Duplicate datagridview values

[=?Utf-8?B?Tmljaw==?=]

Hello,

Dumb question for you. Is there an easy way to detect if a duplicate value
has been entered in a datagrid? I'm allowing users to enter a name in the
first visible column and I want to make sure each value is unique. This is a
Windows forms app.

Thanks for any help, I really appreciate it.

Thanks,
Nick