I am new to interfaces. My simple string parameter in & return of string
worked fine.

BUT I need something better -
-  accept as input a structure, Where is the structure definition maintained
? how isi it used ?

Is this possible & how ?

using System;
using System.Collections;
namespace simpleInterface
{
   public struct controlStruct
   {
       public string ateInstrumClass;
       public Hashtable hashParameters;
   }

  public interface IclassTestDLL11
   {
     
       string HeatControl(controlStruct singleControl);
       string ModifyString(string giveInput);
   }
}