richTextBox different color lines to achieve

MultiColoouredTextBox\MultiColoouredTextBox\MultiColoouredTextBox\bin\Debug\MultiColoouredTextBox.exe
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.....................\.....................\.....................\Form1.cs
.....................\.....................\.....................\Form1.Designer.cs
.....................\.....................\.....................\Form1.resx
.....................\.....................\.....................\MultiColoouredTextBox.csproj
.....................\.....................\.....................\obj\Debug\MultiColoouredTextBox.csproj.FileListAbsolute.txt
.....................\.....................\.....................\...\.....\MultiColoouredTextBox.csproj.GenerateResource.Cache
.....................\.....................\.....................\...\.....\MultiColoouredTextBox.exe
.....................\.....................\.....................\...\.....\MultiColoouredTextBox.Form1.resources
.....................\.....................\.....................\...\.....\MultiColoouredTextBox.pdb
.....................\.....................\.....................\...\.....\MultiColoouredTextBox.Properties.Resources.resources
.....................\.....................\.....................\...\.....\TempPE\Properties.Resources.Designer.cs.dll
.....................\.....................\.....................\Program.cs
.....................\.....................\.....................\...perties\AssemblyInfo.cs
.....................\.....................\.....................\..........\Resources.Designer.cs
.....................\.....................\.....................\..........\Resources.resx
.....................\.....................\.....................\..........\Settings.Designer.cs
.....................\.....................\.....................\..........\Settings.settings
.....................\.....................\MultiColoouredTextBox.sln
.....................\.....................\MultiColoouredTextBox.suo
.....................\.....................\UpgradeLog.XML
.....................\.....................\_UpgradeReport_Files\UpgradeReport.css
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.....................\.....................\....................\UpgradeReport_Minus.gif
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.....................\.....................\MultiColoouredTextBox\obj\Debug\TempPE
.....................\.....................\.....................\bin\Debug
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.....................\.....................\_UpgradeReport_Files
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MultiColoouredTextBox

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