OleDbCommand - pobieranie rekordu

 
private void button_load_Click(object sender, EventArgs e)
        {
            String constr = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" +
                            textBox_path.Text +
                            ";Extended Properties='Excel 12.0 XML;HDR=YES;';";

            OleDbConnection con = new OleDbConnection(constr);
            OleDbCommand oconn = new OleDbCommand("SELECT *  FROM [Arkusz1$] WHERE Cena=83,13", con);
            con.Open();

            OleDbDataAdapter sda = new OleDbDataAdapter(oconn);
            DataTable data = new DataTable();
            sda.Fill(data);
            MainGridView.DataSource = data;

     
        }

 
OleDbCommand oconn = new OleDbCommand("SELECT * FROM [Arkusz1$] WHERE Jm = 'kg'", con);

 
OleDbCommand oconn = new OleDbCommand("SELECT * FROM [Arkusz1$] WHERE Cena = 0.00", con);