c# procedural practice. Treeview control on the exercises, and database links, and show the File Explorer. Link to a database operation part of the class. Mdb Add debug can run. Database which does not optimize the code seems redundant.

Two_Tree
........\README进度（12.7班级的所有操作中差运算操作和遍历）.txt
........\Two_Tree
........\........\bin
........\........\...\Debug
........\........\CQueue.cs
........\........\Form1.cs
........\........\Form1.Designer.cs
........\........\Form1.resx
........\........\obj
........\........\...\Debug
........\........\...\Two_Tree.csproj.FileList.txt
........\........\Program.cs
........\........\Properties
........\........\..........\AssemblyInfo.cs
........\........\..........\Resources.Designer.cs
........\........\..........\Resources.resx
........\........\..........\Settings.Designer.cs
........\........\..........\Settings.settings
........\........\Two_Tree.csproj
........\Two_Tree.sln
班级.mdb

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