PowerShell: Some Tricks in Using the Here-String to Declare Blocks of Code

Trigger COMMAND CLI from within PowerShell

# Fastest way to list all files in a directory. Bar none.
$getFiles = @"
cmd.exe /C dir '$source' /S /B /W /A:-D
"@
$files = Invoke-Expression -Command:$getFiles;    

Loading a dotNet class into PowerShell

# Setting Powershell to skip SSL certificates checking
$classTrustAllCerts = @"
	using System.Net;
	using System.Security.Cryptography.X509Certificates;
	public class TrustAllCertsPolicy : ICertificatePolicy {
	    public bool CheckValidationResult(ServicePoint srvPoint, X509Certificate certificate,WebRequest request, int certificateProblem) {
		return true;
	    }
	}
"@
Add-Type -TypeDefinition $classTrustAllCerts
$trustAllCertsPolicy=New-Object TrustAllCertsPolicy
[System.Net.ServicePointManager]::CertificatePolicy = $trustAllCertsPolicy
[System.Net.ServicePointManager]::SecurityProtocol = [Net.SecurityProtocolType]::Tls12