private void button2_Click(object sender, EventArgs e) { DataTable dataTable = new DataTable(); for (int i = 0; i < dataGridView8.Rows.Count; i++) { dataTable.Rows.Add(); } for (int i = 0; i < dataGridView8.Columns.Count; i++) { dataTable.Columns.Add(); } for (int i = 0; i < dataGridView8.Rows.Count; i++) { for (int j = 0; j < dataGridView8.Columns.Count; j++) { dataTable.Rows[i][j] = dataGridView8.Rows[i].Cells[j].Value; } } MySqlOperations.Print_Jurnal(comboBox4.Text, dateTimePicker2, ID_Prepoda, saveFileDialog1, dataTable); }