Make sure that each project can be built from a clean state (ie no rouge dlls from previous builds)

BuildAllProjectsFromACleanState.ps1

$ErrorActionPreference = "Stop"

function cleanBin {
   param ([string]$path) 
 
    write-host "Cleaning bin from: $path"
    get-childitem $path -include bin -recurse | remove-item -force -confirm:$false -recurse

    write-host "Cleaning obj from: $path"
    get-childitem $path -include obj -recurse | remove-item -force -confirm:$false -recurse
       
       write-host "Cleaning csx from: $path"
    get-childitem $path -include csx -recurse | remove-item -force -confirm:$false -recurse
       
       write-host "Cleaning BuildOutput (no recursive search) from: $path"
    get-childitem $path -include BuildOutput | remove-item -force -confirm:$false -recurse
}

$msbuild = "C:\\Program Files (x86)\\MSBuild\\12.0\\Bin\\MSBuild.exe"

Get-ChildItem *.csproj -Recurse | 
	ForEach-Object { 
		 cleanBin
		 & $msbuild $_.Fullname /verbosity:quiet
		 if($lastexitcode){
			exit $lastexitcode
		 }
	  }