PowerShell Sort Decending?

Hi

I found the following script on the internet that lists all the folders in a given directory and displays the folder size in MB;

$rootPath = "C:\Root-Folder\"
$colItems1 = Get-ChildItem $rootPath
foreach ($i in $colItems1)
{
$colItems = (Get-ChildItem -recurse "$rootPath\$i" | Measure-Object -property length -sum)
"{0:N2}" -f ($colItems.sum / 1MB) + " MB,$i"
"{0:N2}" -f ($colItems.sum / 1MB) + " MB,$i" >>C:\result.txt
}

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Can someone edit it, to sort the results in descending order of size?  (worst offender a the top for example).

Regards,

Pete