using?System;
using?System.Collections.Generic;
using?System.ComponentModel;
using?System.Data;
using?System.Drawing;
using?System.Linq;
using?System.Text;
using?System.Threading.Tasks;
using?System.Windows.Forms;

namespace?Piano
{
????public?partial?class?Form1?:?Form
????{
????????public?Form1（）
????????{
????????????InitializeComponent（）;
????????}

????????private?void?button1_Click（object?sender?EventArgs?e）
????????{
????????????Console.Beep（262?500）;
????????}

????????private?void?button2_Click（object?sender?EventArgs?e）
????????{
????????????Console.Beep（294?500）;
????????}

????????private?void?button3_Click（object?sender?EventArgs?e）
????????{
????????????Console.Beep（330?500）;
????????}

????????private?void?button4_Click（object?sender?

?屬性????????????大小?????日期????時間???名稱
-----------?---------??----------?-----??----
?????目錄???????????0??2017-08-30?21:20??Piano\
?????文件?????????189??2017-08-11?08:58??Piano\App.config
?????目錄???????????0??2017-08-30?21:20??Piano\bin\
?????目錄???????????0??2017-08-30?21:20??Piano\bin\Debug\
?????文件???????12288??2017-08-11?13:27??Piano\bin\Debug\Piano.exe
?????文件?????????189??2017-08-11?08:58??Piano\bin\Debug\Piano.exe.config
?????文件???????26112??2017-08-11?13:27??Piano\bin\Debug\Piano.pdb
?????文件????????3097??2017-08-11?13:27??Piano\Form1.cs
?????文件???????11067??2017-08-11?12:41??Piano\Form1.Designer.cs
?????文件????????6206??2017-08-11?12:41??Piano\Form1.resx
?????目錄???????????0??2017-08-30?21:20??Piano\obj\
?????目錄???????????0??2017-08-30?21:20??Piano\obj\Debug\
?????文件??????????42??2017-08-11?08:58??Piano\obj\Debug\CoreCompileInputs.cache
?????文件????????7373??2017-08-11?08:58??Piano\obj\Debug\DesignTimeResolveAssemblyReferencesInput.cache
?????文件????????1140??2017-08-11?12:39??Piano\obj\Debug\Piano.csproj.FileListAbsolute.txt
?????文件????????1012??2017-08-11?12:42??Piano\obj\Debug\Piano.csproj.GenerateResource.Cache
?????文件????????2384??2017-08-11?10:09??Piano\obj\Debug\Piano.csprojResolveAssemblyReference.cache
?????文件???????12288??2017-08-11?13:27??Piano\obj\Debug\Piano.exe
?????文件?????????180??2017-08-11?12:42??Piano\obj\Debug\Piano.Form1.resources
?????文件???????26112??2017-08-11?13:27??Piano\obj\Debug\Piano.pdb
?????文件?????????180??2017-08-11?10:09??Piano\obj\Debug\Piano.Properties.Resources.resources
?????文件???????????0??2017-08-11?08:58??Piano\obj\Debug\TemporaryGeneratedFile_036C0B5B-1481-4323-8D20-8F5ADCB23D92.cs
?????文件???????????0??2017-08-11?08:58??Piano\obj\Debug\TemporaryGeneratedFile_5937a670-0e60-4077-877b-f7221da3dda1.cs
?????文件???????????0??2017-08-11?08:58??Piano\obj\Debug\TemporaryGeneratedFile_E7A71F73-0F8D-4B9B-B56E-8E70B10BC5D3.cs
?????目錄???????????0??2017-08-11?08:58??Piano\obj\Debug\TempPE\
?????文件????????3557??2017-08-11?10:01??Piano\Piano.csproj
?????文件?????????520??2017-08-11?08:58??Piano\Program.cs
?????目錄???????????0??2017-08-30?21:20??Piano\Properties\
?????文件????????1303??2017-08-11?08:58??Piano\Properties\AssemblyInfo.cs
?????文件????????2897??2017-08-11?08:58??Piano\Properties\Resources.Designer.cs
?????文件????????5612??2017-08-11?08:58??Piano\Properties\Resources.resx
............此處省略2個文件信息