Do You Need To Call REFPROP Methods From C#, VB.NET or VBA? IRefProp .NET-VBA Interface is a lightweight interface to quickly and easily call REFPROP methods in C#, VB.NET, Excel VBA. It consists of an assembly file (.dll) to be used in C# and VB.NET and a type library file (.tlb) to be used in … Continue reading Do You Need To Call REFPROP Methods From C#, VB.NET or VBA?