Datakeys function as property??

Hey there!
I'm wondering if someone can help me - I'm trying to implement a checkbox in a datagrid and I've written the following code to locate which checkbox has been checked:

gridSelections.AppendFormat("The checkbox for {0} was selected <br>", DataGrid1.DataKeys(DataGrid1Item.ItemIndex).ToString());
The compiler keeps throwing the following the error:

System.Web.UI.WebControls.BaseDataList.DataKeys' denotes a 'property' where a 'method' was expected

I'm wondering if someone knows how to solve the above problem?
Thanx

You must have been coding in VB for too long :)

use

DataGrid1.DataKeys[DataGrid1Item.ItemIndex]

instead of

DataGrid1.DataKeys(DataGrid1Item.ItemIndex)