From 4a82988cccddb5ab114cda021389872fbf477b7b Mon Sep 17 00:00:00 2001
From: yibo <361071264@qq.com>
Date: Fri, 22 Sep 2017 21:41:29 +0800
Subject: [PATCH] .

---
 WeighAndGrading/GradeFrom.cs | 1 +
 1 file changed, 1 insertion(+)

diff --git a/WeighAndGrading/GradeFrom.cs b/WeighAndGrading/GradeFrom.cs
index ab4314b..b9491d0 100644
--- a/WeighAndGrading/GradeFrom.cs
+++ b/WeighAndGrading/GradeFrom.cs
@@ -172,6 +172,7 @@ namespace WeighAndGrading
           row.DefaultCellStyle.BackColor = Color.YellowGreen;
       }
       dataGridView.ClearSelection();
+      tangRow = maoRow = null;
     }
 
     void BindDetailGrid()