#requires -version 2.0

Param (
[Parameter(Position=0,Mandatory=$True,HelpMessage="Enter a UNC path like \\server\share")]
[ValidatePattern({^\\\\\S*\\\S*$})]
[ValidateScript({Test-Path -Path $_ })]
[string]$Path
)

Write-Host "Getting top level folder size for $Path" -ForegroundColor Magenta
dir $path | measure-object -Property Length -sum