Check for duplicate items in column of datagrid

[John Cassell]

Hi All.

Could someone point me in the direction of how to check if a particular value appears mutliple times on a datagrid pls..

Example - simple datagrid populated with the following data...

Item, Price
Pie, £2.00
Cake, £0.50
Pie, £2.50

The program would somehow flag up that Pie appears twice in the Item column.

Hope someone can help.

thanks

John