Winform 打字游戏

0-9A-Z随机生成字符小球，每个小球下落速度也是随机的。按下正确的按键，小球消失。小球落到下边框则游戏结束。

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2010-08-14 10:15  TypingTrainingApp\
     文件        2186  2010-08-14 10:14  TypingTrainingApp\Ball.cs
     目录           0  2010-08-11 12:54  TypingTrainingApp\bin\
     目录           0  2010-08-13 10:16  TypingTrainingApp\bin\Debug\
     文件       14848  2010-08-18 15:34  TypingTrainingApp\bin\Debug\TypingTrainingApp.exe
     文件       38400  2010-08-18 15:34  TypingTrainingApp\bin\Debug\TypingTrainingApp.pdb
     文件       14328  2010-08-18 16:01  TypingTrainingApp\bin\Debug\TypingTrainingApp.vshost.exe
     文件         490  2007-07-21 02:33  TypingTrainingApp\bin\Debug\TypingTrainingApp.vshost.exe.manifest
     文件        3039  2010-08-14 10:15  TypingTrainingApp\Game.cs
     文件        1819  2010-08-13 12:45  TypingTrainingApp\MainForm.cs
     文件        5821  2010-08-13 12:44  TypingTrainingApp\MainForm.Designer.cs
     文件        6776  2010-08-13 12:44  TypingTrainingApp\MainForm.resx
     目录           0  2010-08-11 12:42  TypingTrainingApp\obj\
     目录           0  2010-08-18 15:34  TypingTrainingApp\obj\Debug\
     目录           0  2010-08-11 12:54  TypingTrainingApp\obj\Debug\Refactor\
     目录           0  2010-08-11 12:42  TypingTrainingApp\obj\Debug\TempPE\
     文件         741  2010-08-18 16:01  TypingTrainingApp\obj\Debug\TypingTrainingApp.csproj.FileListAbsolute.txt
     文件         850  2010-08-18 15:34  TypingTrainingApp\obj\Debug\TypingTrainingApp.csproj.GenerateResource.Cache
     文件       14848  2010-08-18 15:34  TypingTrainingApp\obj\Debug\TypingTrainingApp.exe
     文件         180  2010-08-14 10:12  TypingTrainingApp\obj\Debug\TypingTrainingApp.MainForm.resources
     文件       38400  2010-08-18 15:34  TypingTrainingApp\obj\Debug\TypingTrainingApp.pdb
     文件         180  2010-08-11 13:01  TypingTrainingApp\obj\Debug\TypingTrainingApp.Properties.Resources.resources
     文件         542  2010-08-11 12:54  TypingTrainingApp\Program.cs
     目录           0  2010-08-11 12:42  TypingTrainingApp\Properties\
     文件        1680  2010-08-11 12:42  TypingTrainingApp\Properties\AssemblyInfo.cs
     文件        3309  2010-08-11 12:42  TypingTrainingApp\Properties\Resources.Designer.cs
     文件        5612  2010-08-11 12:42  TypingTrainingApp\Properties\Resources.resx
     文件        1102  2010-08-11 12:42  TypingTrainingApp\Properties\Settings.Designer.cs
     文件         249  2010-08-11 12:42  TypingTrainingApp\Properties\Settings.settings
     文件        3865  2010-08-11 13:01  TypingTrainingApp\TypingTrainingApp.csproj
     文件         923  2010-08-11 12:42  TypingTrainingApp\TypingTrainingApp.sln
............此处省略1个文件信息