Execute following commands on Visual Studio command prompt:

1) Compile and link your Automation Server CPP file:
Compile:
	cl.exe /c /EHsc AutomationServerWithRegFile.cpp

Link:
	link.exe AutomationServerWithRegFile.obj user32.lib gdi32.lib oleaut32.lib /DLL /DEF:AutomationServerWithRegFile.def /SUBSYSTEM:WINDOWS
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2) Create your IDL file and compile it with MIDL:
MIDL:
	midl /h AutomationProxyStubHeader.h /iid AutomationProxyStubGuids.c /dlldata AutomationProxyStubDllData.c /proxy AutomationProxyStub.c AutomationServerTypeLib.idl
This will generate 3 .c files, 1.h file and 1 Type library(.tlb) file. 
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3) Create Automation Server Proxy Stub DLL:
Use output of above MIDL command(3 .c files, 1 .h file) and create a .def file with 5 functions exported as instructed by sir.
Compile:
	cl.exe /c /EHsc AutomationProxyStub.c  AutomationProxyStubDllData.c AutomationProxyStubGuids.c /D "REGISTER_PROXY_DLL" /D "WIN32" 
Note: /D switch for Preprocessor definition macros
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Link:
	link.exe AutomationProxyStub.obj AutomationProxyStubDllData.obj AutomationProxyStubGuids.obj  user32.lib gdi32.lib oleaut32.lib  rpcns4.lib rpcrt4.lib /DLL  /DEF:AutomationServerTypeLibDll.def /SUBSYSTEM:WINDOWS
Note: extra lib files oleaut32.lib  rpcns4.lib rpcrt4.lib

Single command to compile and link:
cl.exe  /EHsc AutomationProxyStub.c  AutomationProxyStubDllData.c AutomationProxyStubGuids.c /D "REGISTER_PROXY_DLL" /D "WIN32"  /link user32.lib gdi32.lib oleaut32.lib  rpcns4.lib rpcrt4.lib  /DLL  /OUT:"AutomationServerTypeLibDll.dll" /DEF:AutomationServerTypeLibDll.def /SUBSYSTEM:WINDOWS
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Refer sir's instructions for VB and C# clients. Following are the same commands given by sir. They are just added here for quick reference.

i) Import Type Library to create DLL for .net clients:
	tlbimp C:\windows\system32\AutomationServerTypeLib.tlb /out:.\AutomationServerTypeLibForDotNet.dll
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ii) Compile and link VB Client:
	vbc.exe /t:winexe /r:Microsoft.VisualBasic.dll /r:AutomationServerTypeLibForDotNet.dll VBAutomation.vb
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iii) Compile and link C# client:
Use same DLL(generated in Type Library import) for C# also.
	csc.exe /r:AutomationServerTypeLibForDotNet.dll CSharpAutomation.cs