// Fetch the ISYS engine from application scope
IISYSAsp isys = (IISYSAsp) Application["ISYS"];

// Open the required index
IISYSIndex index = (IISYSIndex) isys.OpenIndex(@"c:\index");

// Execute the search
IISYSResultList results = index.PerformFind("manager", 0);
try {

  // Calculate ranges
  int rangeFrom = from;
  int rangeTo = Math.Min(from + count - 1, results.Length);

  // Enumerate
  for (int i = rangeFrom; i <= rangeTo; i++) {
    IISYSDocument document = results.Item(i);
    try {
  
      // Do any required processing on document object

    } finally {
      System.Runtime.InteropServices.ReleaseComObject(document);
    }
  }
} finally {
  System.Runtime.InteropServices.ReleaseComObject(results);
}