C# Error: The type or namespace name ‘List’ could not be found (are you missing a using directive or an assembly reference?)

OMG are your Kidding Me!

OK, I just spent an hour on this thing while trying to get started on another Tim Corey C# Developer tutorial for creating Microsoft Excel files.

When creating a custom model/object for your C# project and try to use it to build a List that made of that custom object type, you’ll be greeted with an error.

C# Error CS0246: The type or namespace name ‘List<>’ could not be found

Error: The type or namespace name ‘List’ could not be found (are you missing a using directive or an assembly reference?) 

Error seen when creating a List of custom objects without using including the using generics statement.

The missing element is a reference to using System.Collections.Generic

Code Example

using OfficeOpenXml;
using System;
using System.IO;
using System.Collections.Generic;

namespace ExcelDemo
    class Program
        static void Main(string[] args)
            //Set the EPPlus license context to nonCommercial so we can play with it :-)
            ExcelPackage.LicenseContext = LicenseContext.NonCommercial;
            var file = new FileInfo(@"c:\scripts\demo.xlsx");

     static List<PersonModel> GetSetupData() 
            List<PersonModel> output = new()
                new() { Id = 1, FirstName= "rick", LastName = "cable" },
                new() { Id = 2, FirstName="bob",LastName= "marley" },
                new() { Id = 3, FirstName="willie",LastName= "nelson" }

            return output;


As always, give credit where credit is due. In this case, a big thank you to David Morton for the post on the Microsoft Visual Studio forums.

I hope this blog post helps somebody!

Cyber Abyss!

How to Run VBScript, 3 Ways to Run a VBScript?

I’ve been using VBScript for many years. Below, I share the 3 different ways you can run VBScript on a Windows PC including running VBSCript as an Administrator.

3 Methods of Running VBScripts

  1. Run VBSCript in Windows Explorer
  2. Run VBScript from Windows Command Line
  3. Run VBScript as a Windows Administrator

For more VBScript info, try these excellent VBScript resources:

1. Run VBScript in Windows Explorer

  • Locate the VBScript file using Windows Explorer or place a copy on your Desktop
  • Identify VBScript files by the .vbs file extension
VBScript files in Windows Explorer
  • Double click the VBScript file.
  • You may or may not see anything depending on the program design.
  • To check to see if VBScript is running.
  • Run Windows task Keys Ctrl+Shift+Esc then sort by Image Name. Look for “wscript.exe”.
  • To kill a VBScript process, right click over “wscript.exe” and select “end process”.
  • You may see more than one “wscript.exe” on the task manager list as it can be run multiple times and new instances will execute.

2. Run VBScript from Windows Command Line

  • Click Windows Start
  • Open Command Window by Typing “CMD” and hit Enter
CMD exe from Windows Start Menu
  • Enter the full file path at the Command Line and hit Enter

3. Run a VBScript as a Windows Administrator

To run a VBScript as a Windows Admin:

  • Create a Windows Batch File that uses WScript.exe to open the .vbs file (See example below)
  • Run Windows Batch file as Admin and Admin Rights pass thru to the VBScript

Example Windows Batch File

Save the file below with a .cmd file extension. Then right click on it and select “Run as Admin”. Admin rights will be passed on to the VBScript

@echo off
pushd %~dp0
C:\Windows\System32\WScript.exe "My_VBScript.vbs"