Call DLL from ASP page
To reference a .NET DLL from an ASP page, use the Url(Action)
method. For details, see the Developer Help published on the Sage CRM Help Center (Reference | ASP objects | CRMBase object | CRMBase methods | Url(Action)).
Example:
myContainer.AddButton(CRM.Button("Add","new.gif",CRM.Url("MyDllFile.dll-MyMethod")));
The referenced .dll file must be stored in the location mentioned in Where to store custom DLLs.