Hi westdh,
Declare the string builder globally
Dim sb As New StringBuilder()
Protected Sub grdAttendees_ItemDataBound(ByVal sender As Object, ByVal e As DataGridItemEventArgs)
If e.Item.ItemType = ListItemType.Item Then
sb.Append(e.Item.Cells(2).Text)
End If
Session("sbEmailAddress") = sb.ToString()
End Sub