I am trying to compile this code in C# 1.1:
/// Summary description for Parser.
public class Parser
[DllImport("query.dll", CharSet = CharSet.Unicode)]
private extern static int LoadIFilter(string pwcsPath, ref IUnknown pUnkOuter, ref IFilter ppIUnk);
..... the rest has been ommited
When i try to compile, it says that "the type or namespace 'IFilter' could not be found" -- does anyone know how to get rid of this error?