private void button1_Click(object sender, EventArgs e) { using (SaveFileDialog sfd = new SaveFileDialog() { Filter = "Excel Workbook| *.xlsx" }) { if (sfd.ShowDialog() == DialogResult.OK) { DataExporter dataExporter = new DataExporter(filename_: sfd.FileName); dataExporter.ExportBalance(dataGridView1, categoriesRows); } } }