how to delete the last row in an unbound datatable in vb.net

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VB

Hi all,
I am working with a datagrid view control , and i need to do the following, delete the last row in the datagrid and make the last row the current row.

Now below is how a work with the datagrid.

1. To load rows of data on to the datagrid what i did was to declare or create a datatable programmatically with columns and row, this datatable in turn loads data or insert data onto the hierarchical datagrid view control, row by row, now i am thinking what if the user wishes to remove the last row (maybe due to error), or wishes to remove rows from the datagrid view, in this order "bottom to top" (will the action be on the datatable that loads data on the datagrid view or on the datagrid view, and how (code) do i do it).

2. After inserting rows of data onto the datagrid view i discovered that the first row is highlighted as current row, how do change this so that the last row of data is the current row.

regards

ade