C# dll to use in classic ASP

Question

I have the following C# code

namespace testDll
{
    class testDLL
    {
        public int add(int val)
        {
            return val + 5;
        }
    }
}

Created dll using Visual Studio Express 2010 i.e going to projet properties, changing the output type to classlibrary and Make assembly COM visible. Everytime I try to register the dll using regsvr32.exe

I get error dllregisterserver entrypoint was not found

Post all relevant code in question. Of course your C# code is missing some require elements to make it even possible to make it a COM library. — Security Hound, Jun 03 '13 at 11:22
See http://stackoverflow.com/questions/4198583/how-do-i-register-a-com-dll-written-in-c-sharp-with-regsvr32 — jfrankcarr, Jun 03 '13 at 11:35
thats the complete class.I though visual studio will automatically convert to dll by selecting "class library". Please point me to the right direction, what am i missing — delwasaf ewrew, Jun 03 '13 at 11:42
@delwasafewrew - a class library project does compile to a "dll", but it's not a regular COM dll. — Hans Keﬆing, Jun 04 '13 at 11:01

score 3 · Accepted Answer · answered Jun 04 '13 at 10:04

you cannot Register a .net dll with regsvr32.exe. you have to use regasm.exe. look here for a description

generally you just use

regasm.exe NameOfDotNetDLL.dll /codebase

furthermore you have to add the ComVisible attribute to your class and every method you want to have comvisible like so

[ComVisibleAttribute( true )]

C# dll to use in classic ASP

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