How do i get all classes, methods and variables in a dll.?

You can use ILSpy open-source .NET assembly browser and decompiler. To install it in visual studio you can use package manager console and type the following command in Tools>NuGet Package Manager>package Manager console PM> Install-Package ICSharpCode.Decompiler

Open visual Studio Command prompt and type "ildasm" and add the dll it will displays all the class,methods and variable in a dll