Setting a connection string password w/ password prompt

Set-ConnectionStringPassword

function Set-ConnectionStringPassword ($xml, $dbName, $dbUser, $connectionStringTemplate) {
    $connString = New-Object System.Data.Common.DbConnectionStringBuilder
    $conStringNodeSelector = $connectionStringTemplate -f $dbName
    $connectionStringString = $xml.SelectSingleNode($conStringNodeSelector).connectionString
    $connString.set_ConnectionString($connectionStringString)

    # we might be using integrated security if so dont ask for pass
    if(![string]::IsNullOrEmpty($connString.password)){
        $prompt = 'What is the {0} password for user {1}?' -f $dbname, $($connString['$dbuser'])
        $SecurePassword = Read-Host $prompt -AsSecureString
        $BSTR = [System.Runtime.InteropServices.Marshal]::SecureStringToBSTR($SecurePassword)
        $connString.password = [System.Runtime.InteropServices.Marshal]::PtrToStringAuto($BSTR)
    }
    $xml.SelectSingleNode($conStringNodeSelector).connectionString = $connString.ConnectionString
    return $xml
}

use_Set-ConnectionStringPassword

[xml] $xml = get-content $webConfigFile
$connectionStringTemplate = "/configuration/connectionStrings/add[@name='{0}']"
$xml = Set-ConnectionStringPass $xml 'ASPNETDB' 'Application User Name' $connectionStringTemplate
$xml.Save($webConfigFile)