Why does getting a xml dataset table return all values?

Currently, I have this Datagridview displaying some XML data, the data is

<?xml version="1.0" encoding="utf-8" ?> <survey><floor location="Drill Floor"><sign location ="1" ref="OFS-FE01" size="180x180"  Material="RPP" Quantity="2" Backingboard="No"  /></floor><floor location="Top Deck"><sign location ="2" ref="OFS-FE07" size="180x180"  Material="RPP" Quantity="2" Backingboard="Yes"  /></floor></survey>

This is where I'm stuck as there are multiple floors and I need a way to display only a chosen floor location.

    private void Form4_Load(object sender, EventArgs e)    {        DataSet dataSet = new DataSet();        dataSet.ReadXml(@"basicStorage.sws", XmlReadMode.Auto);        datagridview.DataSource = dataSet.Tables[1].DataSet.Tables[1];    }

Above is how im loading the datagridview, It works but it gets all the places, while I only want to get it from a certain floor.