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Editorial Team
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Asked: 2026-05-20T18:58:22+00:00

I am having trouble linking to a secondary class in my project – I

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I am having trouble linking to a secondary class in my project – I have attached 2 images which describe the problem best..

Pleas any advice – I thank you in advance.

enter image description here
enter image description here

This error was two things – thank you everybody for your help.
1) add namespace to DB file

namespace C_Classes

{
using System;
…

public class DB

2) Change Target Framework in the Project Properties and change it to “.Net Framework 4” from “…Client Profile”

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1 Answer

  1. Editorial Team

    I’m assuming you’ve added a Project reference to the C_Classes project?

    Otherwise I’ve seen these types of issues when the project is set to target “.Net Framework 4 Client Profile” (which it sometimes sets as the default).

    Check your Target Framework in the Project Properties and change it to “.Net Framework 4”.

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