DataHelper实例化位置修改

UAS-MES/FunctionCode/Make/Make_LabelCheck.cs

@@ -38,7 +38,6 @@ namespace UAS_MES.Make
         public Make_LabelCheck()
         {
             InitializeComponent();
-            dh = new DataHelper();
         }
 
         private void Make_LabelCheck_Load(object sender, EventArgs e)
@@ -49,6 +48,7 @@ namespace UAS_MES.Make
             //打开界面提示用户：请输入SN 
             OperateResult.AppendText(">>请输入SN\n", Color.Green);
             sql = new LogStringBuilder();
+            dh = new DataHelper();
         }
 
         private void Make_LabelCheck_SizeChanged(object sender, EventArgs e)