Description: The csharp achieve the national and provincial selection function, the selected province to determine the appropriate city, the combobox control
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File list (Check if you may need any files):
ex25\ex25\App.config
....\....\bin\Debug\DbComboBox.mdf
....\....\...\.....\DbComboBox_log.ldf
....\....\...\.....\ex25.exe
....\....\...\.....\ex25.exe.config
....\....\...\.....\ex25.pdb
....\....\...\.....\ex25.vshost.exe
....\....\...\.....\ex25.vshost.exe.config
....\....\...\.....\ex25.vshost.exe.manifest
....\....\DbComboBox.mdf
....\....\DbComboBox_log.LDF
....\....\ex25.csproj
....\....\ex25.csproj.user
....\....\Form1.cs
....\....\Form1.Designer.cs
....\....\Form1.resx
....\....\obj\x86\Debug\DesignTimeResolveAssemblyReferences.cache
....\....\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
....\....\...\...\.....\ex25.csproj.FileListAbsolute.txt
....\....\...\...\.....\ex25.exe
....\....\...\...\.....\ex25.Form1.resources
....\....\...\...\.....\ex25.pdb
....\....\...\...\.....\ex25.Properties.Resources.resources
....\....\...\...\.....\GenerateResource.read.1.tlog
....\....\...\...\.....\GenerateResource.write.1.tlog
....\....\...\...\.....\ResolveAssemblyReference.cache
....\....\Program.cs
....\....\...perties\AssemblyInfo.cs
....\....\..........\Resources.Designer.cs
....\....\..........\Resources.resx
....\....\..........\Settings.Designer.cs
....\....\..........\Settings.settings
....\ex25.sln
....\ex25.suo
....\....\obj\x86\Debug\TempPE
....\....\...\...\Debug
....\....\bin\Debug
....\....\obj\x86
....\....\bin
....\....\obj
....\....\Properties
....\ex25
ex25
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