Как открыть файл xls без использования OpenFileDialog?

private void button1_Click(object sender, EventArgs e)
        {
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Filter = "MS Excel | *.xlsx";
            if (dialog.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                OleDbConnection connection = new OleDbConnection(string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 12.0 Xml;HDR=YES\";", dialog.FileName));
                OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [Лист1$]", connection);
                DataTable table = new DataTable();
                adapter.Fill(table);
                dataGridView1.DataSource = table;
            }
                
        }

string path = @"d:\new1.xlsx";
                OleDbConnection connection = new OleDbConnection(string.Format("Provider=Microsoft.ACE.OLEDB.12.0;Data Source={0};Extended Properties=\"Excel 12.0 Xml;HDR=YES\";", path));
                OleDbDataAdapter adapter = new OleDbDataAdapter("SELECT * FROM [Лист1$]", connection);
                DataTable table = new DataTable();
                adapter.Fill(table);
                dataGridView1.DataSource = table;