In. Net itself provided textbox control is not able to show that the number of rows, and this process through a simple code to achieve the textbox show the function of the number of rows

LineNumberingApp

................\AssemblyInfo.cs
................\bin
................\...\Debug
................\...\Release
................\Form1.cs
................\Form1.resx
................\LineNumberBuilder.cs
................\LineNumberingApp.csproj
................\LineNumberingApp.csproj.user
................\LineNumberingApp.sln
................\obj
................\...\Debug
................\...\Release

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