Build.Default.CompileRunnerSources C# (CSharp) Method

        private void CompileRunnerSources()
        {
            FileSet sourceFiles = new FileSet()
                .Include(directory_src_runner)
                .RecurseAllSubDirectories.Filter("*.cs");

             Task.Build.Csc.Target.Executable(x=>x.AddSources(sourceFiles)
                .AddRefences(assembly_FluentBuild_WithTests_Merged)
                .OutputFileTo(assembly_FluentBuild_Runner));
        }