Hi,

I have a C# Exe and a VC++ ATL com dll.
Now I have added the the VC++ ATL com dll to my C# Exe using Add reference.
I can able to call a function in VC++ dll from my C# code.

I have another function in my C# code which has to be called from VC++ something
like a callback.

Let me explain it clearly.
VC++...

#import "D:\\ComCalling\\CSharpExe\\obj\\Debug\\CSharpExe.tlb"no_namespace
IComTestPtr g_CSharpPtr;

STDMETHODIMP CTest::SetValue(BSTR bstrValue)
{
    AFX_MANAGE_STATE(AfxGetStaticModuleState())
    CString csProgId = bstrValue;
    MessageBox ( NULL, csValue, "Title", MB_OK );
    //Now I wanted to call a callback function in C# as something like as shown below...
       //CreateInstance always creates a new instance, I wanted just a callback to the running C# exe which initiated this dll.
    HRESULT hr = g_CSharpPtr.CreateInstance ( __uuidof ( Form1 ) );

    if ( hr == 0 )
    {
        CString csTemp ( "Message From C# Exe" );
        g_CSharpPtr->Display ( csTemp.AllocSysString ( ) );
    }
    return S_OK;
}

C# code...
    public delegate bool CallBack ( );
    public interface IComTest
    {
        void Display ( string sMessage );
    }
    [ClassInterface ( ClassInterfaceType.None )]
    public class Form1 : System.Windows.Forms.Form, IComTest
    {
        public void Display ( string sMessage )
        {
            MessageBox.Show ( sMessage );
        }
        private void button1_Click(object sender, System.EventArgs e)
        {
            TestClass obj = new TestClass ( );
            obj.SetValue ( "Form1" );
The following two lines of code might be the solution, but I don't no how to pass a function pointer to the VC++ dll.
        //    CallBack objCallBack = new CallBack ( CallBackFunction );
        //    obj.SetCallBackPointer ( objCallBack );
        }

       }

Can anyone please help me out to achieve the goal.

Expecting your kind co-operation.

Thanks in advance