COM Class built in VC++ not able to initailize in c# 4.0

Thanks Fred. Regsvr32 or grsvc please confirm and give me some examples how to register. I will really appreciate your help on this.

Thanks Fred.

I have tried But it thorws error as dll was loaded but the entry point DllInstall was not found.

make sure it si valid dll or OCX file, I have build this COM dll and built in VC++ PROJECT WITH OUT ANY ERROR.

Please help on it now.

In that case your problem is stemming from there.
I your DLL doesn't have a DLLInstall entry point (and that is not mandatory to have) then you won't be able to reference directly from your C# application.
You'll have to use the P/Invoke mecanism to interact with your COM DLL from the C# application:

[System.Runtime.InteropServices.DllImport("yourComLib.dll")]
static extern void SomeMethod(....);

You will need to define a external static method in you C# application for each COM method you want to use. But if you want to be able to reference your COM DLL then you should make sure it has DLLInstall and DLLUninstall method.

thanks Fred,

But can you explain with some examples as i am not able to process it further on this.

below is my DLL

[System.Runtime.InteropServices.DllImport("ExactaUtil.dll")]

currently i am usingl ike this way:

protected EXACTAUTILLib.IUtilObj m_objUtil;

// Create an instance of the Util class.
m_objUtil = new EXACTAUTILLib.UtilObjClass();

thanks Fred,

But can you explain with some examples as i am not able to process it further on this.

below is the procsedure currently i am using to call my DLL:

protected EXACTAUTILLib.IUtilObj m_objUtil;
// Create an instance of the Util class.
m_objUtil = new EXACTAUTILLib.UtilObjClass();
m_objUtil.SetDBConnectionInfo(m_szDBUserID, m_szDBPassword, m_szAdoDSN, m_szOdbcDSN);

please explain how i can call using P/Invoke mecanism



thanks and Regards
Kush Sharma