PowerShell update connection strings

I have the following script that will update the connection string across three different config files used in development.

function Main()
{   
pushd
cd ..
$aomsDir = pwd
$configFiles = @( 'util\GeneratePocos.exe.config', 'src\Web.UI\web.config', 'src\Data\App.Config')

$MyAOMSEntitiesConnStr = $env:AOMS_CONN_STR

Write-Host 'Beginning update of Connection strings...'

foreach($file in $configFiles)
{
    $config = New-Object XML
    $config.Load("$aomsDir\$file")

    foreach($conStr in $config.configuration.connectionStrings.add)
    {
        if($conStr.name -ieq 'AOMSEntities')
        {
            $conStr.connectionString = $MyAOMSEntitiesConnStr
        }
    }

    $config.Save("$aomsDir\$file")
}

Write-Host 'Completed updating connection strings for your machine.'

popd

}

Main

The problem is that the connection string needs to include "e; but when the config file is saved this becomes &quote; As a result the connection string is no longer valid.

Does anyone know of a way to do this, I thought about doing a text replace of the file but maybe there is a cleaner way.

Thanks for your help.