You can create a DataView on your DataTable to only include the Deleted records. You use the RowStateFilter like below:

Dim dv As New DataView(ds.Tables("MyDataTable"),"","",DataViewRowState.Deleted)

>I'm using a DataGrid to edit a table in a DataSet in a Web form. When the user clicks on the Delete button for a row, the row is marked Deleted in the DataSet. After various rows are edited, I need to iterate through the edited rows and do some database operations that depend on the values of the primary key fields for these rows. How can I get the key after the row is deleted? (You cannot access the columns of a deleted row directly.)
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>I suppose I could keep an array of keys of deleted records and add the row key to the array when the row is deleted, but that seems like a lot of work.