controlling up/down in datagrid

I have a DataGrid which has a dataset/table sucessfully bound to it. Is there any way I can control when a user moves up or down the datagrid i.e when they use the up/down arrows to move to different rows of the grid I looked to see if there was perhaps an event on the datagrid, such as "RowEnter" which would fire each time a row was entered, but could see no such event. There are events which are to do with "Mouse" movements, (up/down/press etc .. ) - but these only solve half the problem because a user can obviously use the keyboard as well as the mouse Any ideas ? Thx