BuildManager.AddReferencedAssembly Method (Assembly)
Adds an assembly to the application's set of referenced assemblies.
Assembly: System.Web (in System.Web.dll)
Calling this method is equivalent to adding the assembly to the application-level Web.config file. The method must be called during the Application_PreStartInit stage of the application.
The GetReferencedAssemblies method will return the set of assemblies that are determined from configuration files and any assemblies that were added by using this method.
If an attempt is made to add an assembly that has already been added, the duplicate entry is ignored.
This method must be called before the Application_Start event in the Global.asax file occurs.
Available since 4.0