Namespace: System.Runtime.CompilerServices Building .NET Components for use by COM .Net framework generates COM Proxies known as COM Callable Wrapper (CCW) to be used by COM. No matter how many COM clients consume a given managed object, .Net runtime will create a single CCW. Write down you class and before building it, Select the configuration form the project properties named “ Register for COM interop ”. Hiding public .NET Classes from COM To hide a class or member just use the following attribute: [ComVisible(true/false)] . Deploying COM-Enabled Assemblies : Check the following necessaries before creating CCW: 1. All class have default constructor (no parameter). 2. Exposed Types should be public . 3. Any member exposed should be public . 4. Abstract classes will not b...