Generate a random Alphanumeric string in PowerShell.

function Get-RandomAlphanumericString
{
    [CmdletBinding()]
    Param ([int] $length = 8)

    Begin {}

    Process
    {
        Write-Output (-join ((0x30..0x39) + ( 0x41..0x5A) + ( 0x61..0x7A) | Get-Random -Count $length  | % {[char]$_}))
    }
}