Hello,
I created a COM Server .NET dll that works fine as an InProcServer. It
creates it's own OdbcConnection and saves the passed data to DB.
But the DB-connection of the application using this COM server gets
messed up when the new connection is opened (some wierd ODBC 2 vs ODBC
3 stuff).
The solution would be to run the COM Server in a separate process.
First I read this is not possible in .NET (shocking!) then I stumbled
over this sdk sample COMREG but couldn't get it to work.
What do I have to do to convert my DLL into an OutProcServer?
Can I use DllHost? Do I have to make an exe out of it? What would the
Main Method look like and do I have to show a Form?

I have little experience in COM programming and was happy the server
worked.
But now I am stuck. Please help.

The "entry point" of the DLL is the class Application.

using System;
using System.Runtime.InteropServices;
using ...

namespace IkarosGMV.COM {
    /// <summary>
    /// Zusammenfassung für Application.
    /// </summary>
    [ClassInterface(ClassInterfaceType.AutoDual)]
    [Guid("D36F350B-7200-468f-8459-6BA8512BFD46")]
    public class Application {
        private Error _error;
       
        public Application() {
            _error = new Error();
        }
               
        public Error Error {
            get {return _error;}
        }
       
        public int AnzahlNeuerNachrichten {
             get {
                // get some data from db
                       ......
                }
                return anz;
            }
        }
               
        public void LogIn(string DSN,string DBN, string UID, string PWD) {
            try {
                // creates new connection
                       ......

                this._error.IsError = false;               
            } catch (Exception exc) {
                _error.IsError = true;
                _error.Message = exc.GetType().FullName + ": " + exc.Message;
            }
        }
           // other methods and properties
            ......
}       

The regfile otuput from COMREG looks like this:
REGEDIT4

[HKEY_CLASSES_ROOT\IkarosGMV.COM.Application]
@="IkarosGMV.COM.Application"

[HKEY_CLASSES_ROOT\IkarosGMV.COM.Application\CLSID]
@="{D36F350B-7200-468F-8459-6BA8512BFD46}"

[HKEY_CLASSES_ROOT\CLSID\{D36F350B-7200-468F-8459-6BA8512BFD46}]
@="IkarosGMV.COM.Application"
"AppID"="{D36F350B-7200-468F-8459-6BA8512BFD46}"

[HKEY_CLASSES_ROOT\CLSID\{D36F350B-7200-468F-8459-6BA8512BFD46}\InprocServer32]
@="mscoree.dll"
"ThreadingModel"="Both"
"Class"="IkarosGMV.COM.Application"
"Assembly"="IkarosGMV.COM, Version=1.0.1781.16813, Culture=neutral,
PublicKeyToken=85dfcfbcc43007db"
"RuntimeVersion"="v1.1.4322"
"Codebase"="file:///I:/Testumgebung/IKAROS-GMV/IkarosGMV.COM.DLL"

[HKEY_CLASSES_ROOT\CLSID\{D36F350B-7200-468F-8459-6BA8512BFD46}\ProgId]
@="IkarosGMV.COM.Application"

[HKEY_CLASSES_ROOT\AppID\{D36F350B-7200-468F-8459-6BA8512BFD46}]
@="IkarosGMV.COM.Application"
"AppID"="{D36F350B-7200-468F-8459-6BA8512BFD46}"
"DllSurrogate"=""
"RunAs"="Interactive User"

[HKEY_CLASSES_ROOT\CLSID\{D36F350B-7200-468F-8459-6BA8512BFD46}\Implemented
Categories\{62C8FE65-4EBB-45e7-B440-6E39B2CDBF29}]
@=""

[HKEY_CLASSES_ROOT\Component
Category\{62C8FE65-4EBB-45e7-B440-6E39B2CDBF29}]
"0"=""