diff --git a/ViewModel/Grading/GradingResultVM.cs b/ViewModel/Grading/GradingResultVM.cs
index 0d56b0c..d29af69 100644
--- a/ViewModel/Grading/GradingResultVM.cs
+++ b/ViewModel/Grading/GradingResultVM.cs
@@ -72,6 +72,7 @@ public class GradingResultVM : BaseViewModel
             machine = "71953";
         }
         InitCombobox();
+        DS = "NA";
         AutoSave();
     }
 
@@ -574,8 +575,8 @@ public class GradingResultVM : BaseViewModel
     {
         TxtFile(filePath);
         ExcelFile(filePath);
-        DatFile(filePath);
-        STLFile(filePath);
+            DatFile(filePath);
+            STLFile(filePath);
     }
 
     private void TxtFile(string filePath)