Description: Text box can only enter a number of examples written in C#, very good, you can reference
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File list (Check if you may need any files):
NumberTextBox\NumberTextBox\Properties\Settings.settings
.............\.............\..........\AssemblyInfo.cs
.............\.............\..........\Resources.resx
.............\.............\..........\Resources.Designer.cs
.............\.............\..........\Settings.Designer.cs
.............\.............\NumberTextBox.cs
.............\.............\NumberTextBox.csproj
.............\.............\bin\Debug\NumberTextBox.dll
.............\.............\...\.....\NumberTextBox.pdb
.............\.............\obj\Debug\TempPE\Properties.Resources.Designer.cs.dll
.............\.............\...\.....\CSharpWin.Properties.Resources.resources
.............\.............\...\.....\NumberTextBox.csproj.GenerateResource.Cache
.............\.............\...\.....\NumberTextBox.pdb
.............\.............\...\.....\NumberTextBox.dll
.............\.............\...\NumberTextBox.csproj.FileList.txt
.............\NumberTextBox.sln
.............\NumberTextBox.suo
.............\.............Demo\Properties\Settings.settings
.............\.................\..........\AssemblyInfo.cs
.............\.................\..........\Resources.resx
.............\.................\..........\Resources.Designer.cs
.............\.................\..........\Settings.Designer.cs
.............\.................\Form1.resx
.............\.................\Form1.Designer.cs
.............\.................\NumberTextBoxDemo.csproj
.............\.................\bin\Debug\NumberTextBoxDemo.vshost.exe
.............\.................\...\.....\NumberTextBox.dll
.............\.................\...\.....\NumberTextBox.pdb
.............\.................\...\.....\NumberTextBoxDemo.exe
.............\.................\...\.....\NumberTextBoxDemo.pdb
.............\.................\obj\Debug\NumberTextBoxDemo.Form1.resources
.............\.................\...\.....\NumberTextBoxDemo.Properties.Resources.resources
.............\.................\...\.....\NumberTextBoxDemo.csproj.GenerateResource.Cache
.............\.................\...\.....\NumberTextBoxDemo.pdb
.............\.................\...\.....\NumberTextBoxDemo.exe
.............\.................\...\.....\ResolveAssemblyReference.cache
.............\.................\...\NumberTextBoxDemo.csproj.FileList.txt
.............\.................\Program.cs
.............\.................\Form1.cs
.............\.............\obj\Debug\TempPE
.............\.............Demo\obj\Debug\TempPE
.............\.............\bin\Debug
.............\.............\obj\Debug
.............\.............Demo\bin\Debug
.............\.................\obj\Debug
.............\.............\Properties
.............\.............\bin
.............\.............\obj
.............\.............Demo\Properties
.............\.................\bin
.............\.................\obj
.............\NumberTextBox
.............\NumberTextBoxDemo
NumberTextBox