diff --git a/Cartesian_chart_sample/CartesianChartSample/ViewModel.cs b/Cartesian_chart_sample/CartesianChartSample/ViewModel.cs
index 0b27e9c..0836119 100644
--- a/Cartesian_chart_sample/CartesianChartSample/ViewModel.cs
+++ b/Cartesian_chart_sample/CartesianChartSample/ViewModel.cs
@@ -24,7 +24,7 @@ public PersonViewModel()
     }
     public class PersonModel
     {
-        public string Name { get; set; }
+        public string Name { get; set; } = String.Empty;
         public double Height { get; set; }
     }
 }