C#自动定时创建文本文件并写入随机内容

本代码实现定时创建不重名的文本文件，并在文件中写入随机字符串。

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2017-04-03 11:58  WindowsFormsApp1\
     目录           0  2017-04-03 11:58  WindowsFormsApp1\.vs\
     目录           0  2017-04-03 11:58  WindowsFormsApp1\.vs\WindowsFormsApp1\
     目录           0  2017-04-03 11:58  WindowsFormsApp1\.vs\WindowsFormsApp1\v15\
     文件       45056  2017-04-08 17:56  WindowsFormsApp1\.vs\WindowsFormsApp1\v15\.suo
     目录           0  2017-04-08 17:56  WindowsFormsApp1\WindowsFormsApp1\
     文件         947  2017-04-04 16:50  WindowsFormsApp1\WindowsFormsApp1\App.config
     文件         192  2017-04-03 13:28  WindowsFormsApp1\WindowsFormsApp1\Class1.cs
     文件        4137  2017-04-08 17:56  WindowsFormsApp1\WindowsFormsApp1\Form1.Designer.cs
     文件        2393  2017-04-08 17:56  WindowsFormsApp1\WindowsFormsApp1\Form1.cs
     文件        6011  2017-04-08 17:56  WindowsFormsApp1\WindowsFormsApp1\Form1.resx
     文件         528  2017-04-03 11:58  WindowsFormsApp1\WindowsFormsApp1\Program.cs
     目录           0  2017-04-08 11:53  WindowsFormsApp1\WindowsFormsApp1\Properties\
     文件        1330  2017-04-03 11:58  WindowsFormsApp1\WindowsFormsApp1\Properties\AssemblyInfo.cs
     目录           0  2017-04-08 11:53  WindowsFormsApp1\WindowsFormsApp1\Properties\DataSources\
     文件         595  2017-04-08 11:53  WindowsFormsApp1\WindowsFormsApp1\Properties\DataSources\Class1.datasource
     文件         593  2017-04-08 11:53  WindowsFormsApp1\WindowsFormsApp1\Properties\DataSources\Form1.datasource
     文件         597  2017-04-08 11:53  WindowsFormsApp1\WindowsFormsApp1\Properties\DataSources\Program.datasource
     文件         612  2017-04-08 11:53  WindowsFormsApp1\WindowsFormsApp1\Properties\DataSources\WindowsFormsApp1.Properties.Resources.datasource
     文件         610  2017-04-08 11:53  WindowsFormsApp1\WindowsFormsApp1\Properties\DataSources\WindowsFormsApp1.Properties.Settings.datasource
     文件        2845  2017-04-03 11:58  WindowsFormsApp1\WindowsFormsApp1\Properties\Resources.Designer.cs
     文件        5612  2017-04-03 11:58  WindowsFormsApp1\WindowsFormsApp1\Properties\Resources.resx
     文件        1544  2017-04-04 16:50  WindowsFormsApp1\WindowsFormsApp1\Properties\Settings.Designer.cs
     文件         428  2017-04-04 16:50  WindowsFormsApp1\WindowsFormsApp1\Properties\Settings.settings
     目录           0  2017-04-03 11:58  WindowsFormsApp1\WindowsFormsApp1\bin\
     目录           0  2017-04-08 17:57  WindowsFormsApp1\WindowsFormsApp1\bin\Debug\
     文件       10752  2017-04-08 17:57  WindowsFormsApp1\WindowsFormsApp1\bin\Debug\WindowsFormsApp1.exe
     文件         947  2017-04-04 16:50  WindowsFormsApp1\WindowsFormsApp1\bin\Debug\WindowsFormsApp1.exe.config
     文件       22016  2017-04-08 17:57  WindowsFormsApp1\WindowsFormsApp1\bin\Debug\WindowsFormsApp1.pdb
     目录           0  2017-04-03 11:58  WindowsFormsApp1\WindowsFormsApp1\obj\
     目录           0  2017-04-08 17:57  WindowsFormsApp1\WindowsFormsApp1\obj\Debug\
............此处省略18个文件信息