/**
  * <summary>
  *   Returns the measuring unit for the measured value.
  * <para>
  * </para>
  * <para>
  * </para>
  * </summary>
  * <returns>
  *   a string that represents a physical unit.
  * </returns>
  * <para>
  *   On failure, throws an exception or returns  <c>YDataSet.UNIT_INVALID</c>.
  * </para>
  */
 public virtual string get_unit()
 {
     return(_objref.get_unit());
 }