fix auto save bug

ViewModel/Grading/GradingResultVM.cs

@@ -282,6 +282,8 @@ public class GradingResultVM : BaseViewModel
     }
     [Log]
     private void SaveToCsv()
+    {
+        try
         {
             string strBaseUrl = AppDomain.CurrentDomain.BaseDirectory;
             string filePath = Path.Combine(AppDomain.CurrentDomain.BaseDirectory, "csv", "histroy.csv");
@@ -304,7 +306,8 @@ public class GradingResultVM : BaseViewModel
                 $"," +
                 $"," +
                 $"{GetGradeEnName(GetGradeOrder(CutLevelTotal))}";
-        if (File.Exists(filePath)) { 
+            if (File.Exists(filePath))
+            {
                 using (var writer = new StreamWriter(filePath, true))
                 {
 
@@ -314,7 +317,8 @@ public class GradingResultVM : BaseViewModel
             else
             {
                 File.Create(filePath).Close();
-            string header = "Diamond Code,Wight,Measurement1, Measurement2, Measurement3, Table, Crown Height,Pavilion Depth, Total Depth,Crown Angle, Pavilion Angle,Culet Size, Girdle Percent,Girdle Name, POL or Pol/ Sym,SYM,CUT - PROP";
+                string header =
+                    "Diamond Code,Wight,Measurement1, Measurement2, Measurement3, Table, Crown Height,Pavilion Depth, Total Depth,Crown Angle, Pavilion Angle,Culet Size, Girdle Percent,Girdle Name, POL or Pol/ Sym,SYM,CUT - PROP";
                 using (var writer = new StreamWriter(filePath, true))
                 {
                     writer.WriteLine(header);
@@ -322,6 +326,11 @@ public class GradingResultVM : BaseViewModel
                 }
             }
         }
+        catch (Exception ex)
+        {
+            Logger.Error($"Auto Save Error: {ex.Message}");
+        }
+    }
 
     private void saveTempDS(string selValue)
     {