public ApproxMeasurement(string displayText, StructuredMeasurement measurement)
 {
     if (string.IsNullOrEmpty(displayText) && measurement != null)
     {
         displayText = measurement.ToString();
     }
     if (string.IsNullOrEmpty(displayText))
     {
         throw new ArgumentException("displayText");
     }
     Display = displayText;
     Measurement = measurement;
 }
 public ApproxMeasurement(string displayText, StructuredMeasurement measurement)
 {
     if (string.IsNullOrEmpty(displayText) && measurement != null)
     {
         displayText = measurement.ToString();
     }
     if (string.IsNullOrEmpty(displayText))
     {
         throw new ArgumentException("displayText");
     }
     Display     = displayText;
     Measurement = measurement;
 }