Response Unmarshaller for Select operation
Inheritance: XmlResponseUnmarshaller
 public static SelectResponseUnmarshaller GetInstance()
 {
     if (instance == null)
     {
         instance = new SelectResponseUnmarshaller();
     }
     return(instance);
 }
 public static SelectResponseUnmarshaller GetInstance()
 {
     if (instance == null) 
     {
        instance = new SelectResponseUnmarshaller();
     }
     return instance;
 }