A small winform program, suitable for novice to learn.

Demo
....\01_MaskedTextBox
....\................\01_MaskedTextBox.csproj
....\................\app.config
....\................\bin
....\................\...\Debug
....\................\...\.....\01_MaskedTextBox.exe
....\................\...\.....\01_MaskedTextBox.exe.config
....\................\...\.....\01_MaskedTextBox.pdb
....\................\...\.....\01_MaskedTextBox.vshost.exe
....\................\...\.....\01_MaskedTextBox.vshost.exe.config
....\................\...\.....\01_MaskedTextBox.vshost.exe.manifest
....\................\...\Release
....\................\Form1.cs
....\................\Form1.Designer.cs
....\................\Form1.resx
....\................\IPv4.cs
....\................\obj
....\................\...\x86
....\................\...\...\Debug
....\................\...\...\.....\01_MaskedTextBox.csproj.FileListAbsolute.txt
....\................\...\...\.....\01_MaskedTextBox.exe
....\................\...\...\.....\01_MaskedTextBox.pdb
....\................\...\...\.....\DesignTimeResolveAssemblyReferences.cache
....\................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
....\................\...\...\.....\GenerateResource-ResGen.read.1.tlog
....\................\...\...\.....\GenerateResource-ResGen.write.1.tlog
....\................\...\...\.....\GenerateResource.read.1.tlog
....\................\...\...\.....\GenerateResource.write.1.tlog
....\................\...\...\.....\ResolveAssemblyReference.cache
....\................\...\...\.....\TempPE
....\................\...\...\.....\......\Properties.Resources.Designer.cs.dll
....\................\...\...\.....\_01_MaskedTextBox.Form1.resources
....\................\...\...\.....\_01_MaskedTextBox.Properties.Resources.resources
....\................\Program.cs
....\................\Properties
....\................\..........\AssemblyInfo.cs
....\................\..........\Resources.Designer.cs
....\................\..........\Resources.resx
....\................\..........\Settings.Designer.cs
....\................\..........\Settings.settings
....\02_RichTextBox_Simple
....\.....................\02_RichTextBox_Simple.csproj
....\.....................\bin
....\.....................\...\Debug
....\.....................\...\.....\02_RichTextBox_Simple.exe
....\.....................\...\.....\02_RichTextBox_Simple.pdb
....\.....................\...\.....\02_RichTextBox_Simple.vshost.exe
....\.....................\...\.....\02_RichTextBox_Simple.vshost.exe.manifest
....\.....................\...\.....\yan.gif
....\.....................\...\Release
....\.....................\Form1.cs
....\.....................\Form1.Designer.cs
....\.....................\Form1.resx
....\.....................\obj
....\.....................\...\x86
....\.....................\...\...\Debug
....\.....................\...\...\.....\02_RichTextBox_Simple.csproj.FileListAbsolute.txt
....\.....................\...\...\.....\02_RichTextBox_Simple.exe
....\.....................\...\...\.....\02_RichTextBox_Simple.pdb
....\.....................\...\...\.....\DesignTimeResolveAssemblyReferences.cache
....\.....................\...\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
....\.....................\...\...\.....\GenerateResource.read.1.tlog
....\.....................\...\...\.....\GenerateResource.write.1.tlog
....\.....................\...\...\.....\ResolveAssemblyReference.cache
....\.....................\...\...\.....\TempPE
....\.....................\...\...\.....\_02_RichTextBox_Simple.Form1.resources
....\.....................\...\...\.....\_02_RichTextBox_Simple.Properties.Resources.resources
....\.....................\Program.cs
....\.....................\Properties
....\.....................\..........\AssemblyInfo.cs
....\.....................\..........\Resources.Designer.cs
....\.....................\..........\Resources.resx
....\.....................\..........\Settings.Designer.cs
....\.....................\..........\Settings.settings
....\03_Calculator
....\.............\03_Calculator.csproj
....\.............\bin
..

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