how to clear txt box with button click envent

Clear\Clear\bin\Debug\Clear.dll
.....\.....\...\.....\Clear.pdb
.....\.....\Class1.cs
.....\.....\Clear.csproj
.....\.....\obj\Debug\Clear.csproj.FileListAbsolute.txt
.....\.....\...\.....\Clear.dll
.....\.....\...\.....\Clear.pdb
.....\.....\...\.....\DesignTimeResolveAssemblyReferencesInput.cache
.....\.....\Properties\AssemblyInfo.cs
.....\Clear.sln
.....\Clear.suo
.....\.....\obj\Debug\TempPE
.....\.....\bin\Debug
.....\.....\obj\Debug
.....\.....\bin
.....\.....\obj
.....\.....\Properties
.....\Clear
Clear

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