C# openFileDialog的使用方法

    /// <summary>
        /// 打开文件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void button3_Click(object sender, EventArgs e)
        {
            FileDialog oneFileDialog1 = new OpenFileDialog();
            //openFileDialog1.InitialDirectory = "C:\\";//这一段代码能够执行。
            openFileDialog1.Filter = "Excel文件（*.xls）|*.xls";
            openFileDialog1.FilterIndex = 0;
            //openFileDialog1.RestoreDirectory = true;
            //openFileDialog1.ShowHelp = true;
            //openFileDialog1.Title = "打开文件";
            openFileDialog1.ShowDialog();


        }