Provide PowerShell upload .zip file to FTPS script

Send-FTPSFiles.ps1

param (
    [string]$sourceDir
)

$ftpaddr = "example.com/upload/"

# option
$assemblies = (
    "System, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL",
    "System.IO, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL",
    "System.Net, Version=4.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a, processorArchitecture=MSIL")

# csharp code
$sourcecode = @"
using System;
using System.IO;
using System.Net;
namespace NetTool
{
    public class FTPS
    {
        public static string Upload(string ftpaddr, string filepath)
        {
            string ftppath = string.Format("ftp://{0}",ftpaddr);
            FtpWebRequest request = (FtpWebRequest)WebRequest.Create(ftppath);
            request.Credentials = new NetworkCredential("username", "password");
            request.Method = WebRequestMethods.Ftp.UploadFile;
            // support FTPS
            request.EnableSsl = true;
            request.UseBinary = true;
            request.KeepAlive = true;
            request.UsePassive = true;
            byte[] fileContents;
            using (StreamReader sourceStream = new StreamReader(filepath))
            {
                fileContents = System.Text.Encoding.UTF8.GetBytes(sourceStream.ReadToEnd());
            }
            request.ContentLength = fileContents.Length;
            using (Stream requestStream = request.GetRequestStream())
            {
                requestStream.Write(fileContents, 0, fileContents.Length);
            }
            using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
            {
                string status = string.Format("Upload File Complete, status {0}", response.StatusDescription);
                return status;
            }
        }
    }
}
"@
# create .net object
Add-Type -ReferencedAssemblies $assemblies -TypeDefinition $sourcecode -Language CSharp

$files = Get-ChildItem -Path $sourceDir -Include *.zip
if ($files) {
    foreach ($file in $files) {
        $ftpaddr += $file.Name
        $status = [NetTool.FTPS]::Upload($ftpaddr, $file.FullName)
        Write-Host "Message: $status"
    }
}