In .NET Framework, in order to view the content of an assembly ILDASM.exe can be used. As an external tool ILDASM, it can be added to Visual Studio from development environment of VS.
To add ILDASM to to the VS, click -Tools- from the menu, and select the -External Tools-.
Click -Add- in new window. In the new window, type -ildasm- into the title box and select -Browse-. Navigate to the one of following folders to find ildasm.exe in directory, and select the ildasm.exe to add into tools menu of Visual Studio.
C:\Program Files\Microsoft Visual Studio .NET\FrameworkSDK\Bin
or
C:\Program Files (x86)\Microsoft SDKs\Windows\v5.0\Bin
or
C:\Program Files (x86)\Microsoft SDKs\Windows\v6.0A\Bin
or
C:\Program Files (x86)\Microsoft SDKs\Windows\v7.0A\Bin
After selecting -OK-, ildasm.exe, the MSIL Disassembler tool of VS is added to the tools menu of Visual Studio. A DLL or related file which is compiled as Class library or relevant can be opened with ildasm.exe to view its contents, available class-methods structured within, external references, metadata or manifest.
Details which are related to the ildasm.exe are available at reference link of MSDN.