dll not in my executable file, working in visual studio but not on execution

Question

I'm new to the community. I have a major problem in one of my project. I'm at school but this is a personal project so teachers won't be of any help. I work with Visual Studio in C#.

In my project, I get mails from a specific dedicated Gmail account in POP3. I use S22.POP3 because it's a free assembly and works very well with what I'm trying to do.

So here's my problem: When I use the executable I get an error:

System.IO.FileNotFoundException

The error says that the file or the assembly is missing.

After a lot of searching and trying I still don't know what to do. I looked up the interop thing that is on the propriety of the reference but it doesn't seem to be the way to go. It create some errors where I use the class from the assembly. Then I looked up DllImport but I am pretty inexperienced and I don't understand it at all. I tried something like this :

[DllImport("S22.Pop3.dll")]
static extern

But I don't understand what I'm doing here and it's kind of obvious that it doesn't work. I know that I at least need to put something after static extern but I don't know what? Anyway this is maybe not the way to go.

I have also seen some people talking about ILMerge. But same problem here I don't know what I'm doing. From the documentation I've found it's for implementing C++.

Please help me, and if you have time, try to do an executable that is able to get mail. Because in Visual Studio it works fine. Once an executable I get the error.

Answer 1

You don't need to use DllImport as this library is managed code.

Just use Nuget to install it like this.

And then follow the tutorial from the project page.

Here is the first example:

using System;
using S22.Pop3;

namespace Test {
    class Program {
        static void Main(string[] args) {
            /* connect on port 995 using SSL */
            using (Pop3Client Client = new Pop3Client("pop.gmail.com", 995, true))
            {
                Console.WriteLine("We are connected!");
            }
        }
    }
}