private void BtnExport_Click(object sender, EventArgs e) { ExportToExcel excel = new ExportToExcel(); string query = "SELECT * FROM dbo.PhuTung"; System.Data.DataTable data = DataProvider.Instance.ExecuteQuery(query); excel.ExportPhuTung(data, "Danh sach PT", "DANH SÁCH PHỤ TÙNG"); }