Sum column to textbox where condition is word

Question

Try this...result is 0

 

What I miss?

 

////gotovina
           double[] columnData2 = new double[mp_kasa_listaDataGridView.Rows.Count];
           columnData2 = (from DataGridViewRow row in mp_kasa_listaDataGridView.Rows
                          where row.Cells["dataGridViewTextBoxColumn16"].FormattedValue.ToString() != string.Empty && (row.Cells["dataGridViewTextBoxColumn14"].ToString()) == ("Gotovina").ToString()// && System.DateTime.ParseExact("d.M.yyyy", row.Cells["dataGridViewTextBoxColumn4"].ToString(), System.Globalization.CultureInfo.InvariantCulture) == System.DateTime.Now.Date
                          select Convert.ToDouble(row.Cells["dataGridViewTextBoxColumn16"].FormattedValue)).ToArray();
           textBox3.Text = columnData2.Sum().ToString("#,0.00");