C# 打开指定文件夹下的excel

先弹出一个对话框

            if (MessageBox.Show("EXCEL will open", "Sure", MessageBoxButtons.YesNo) == DialogResult.Yes)
            {
                System.Diagnostics.Process p = new System.Diagnostics.Process();
                p.StartInfo.UseShellExecute = true;
                p.StartInfo.FileName = Gloable.excel_path;//"D:\\openexcel.xlsx";
                p.Start();
            }