Powershell: Random password generator

Sometime you just need to generate random passwords, this function does that, it can be configured for different lengths and the number of alpha numeric characters.

####################################
# Author: Richard Easton
# Description: Random Password generator
# Usage: New-RandomPassword -MinimumPasswordLength 10 -MaximumPasswordLength 15 -NumberOfAlphaNumericCharacters 6
####################################

function New-RandomPassword {
    param(
        [Parameter()]
        [int]$MinimumPasswordLength = 8,
        [Parameter()]
        [int]$MaximumPasswordLength = 20,
        [Parameter()]
        [int]$NumberOfAlphaNumericCharacters = 5,
        [Parameter()]
        [switch]$ConvertToSecureString
    )
    
    Add-Type -AssemblyName 'System.Web'
    $length = Get-Random -Minimum $MinimumPasswordLength -Maximum $MaximumPasswordLength
    $password = [System.Web.Security.Membership]::GeneratePassword($length,$NumberOfAlphaNumericCharacters)
    if ($ConvertToSecureString.IsPresent) {
        ConvertTo-SecureString -String $password -AsPlainText -Force
    } else {
        $password
    }
}

New-RandomPassword -MinimumPasswordLength 10 -MaximumPasswordLength 15 -NumberOfAlphaNumericCharacters 6