C:\Program Files (x86)\Microsoft Visual Studio 11.0\VC>Tlbimp.exe "C:\Users\Milind\AppData\Local\REDI Tech\Primary\Redi.tlb" Microsoft (R) .NET Framework Type Library to Assembly Converter 4.0.30319.18020 Copyright (C) Microsoft Corporation. All rights reserved. TlbImp : warning TI3015 : At least one of the arguments for 'RediLib.ICacheControl.GetCells' cannot be marshaled by the runtime marshaler. Such arguments will therefore be passed as a pointer and may require unsafe code to manipulate. TlbImp : warning TI3015 : At least one of the arguments for 'RediLib.CacheControlClass.GetCells' cannot be marshaled by the runtime marshaler. Such arguments will therefore be passed as a pointer and may require unsafe code to manipulate. TlbImp : error TI1000 : The type library importer encountered an unexpected exception: System.IO.IOException - Access is denied. (Exception from HRESULT: 0x80070005 (E_ACCESSDENIED))