diff --git a/StuMgmClient/StudentTree.cs b/StuMgmClient/StudentTree.cs
index 22bdb36..fd5796a 100644
--- a/StuMgmClient/StudentTree.cs
+++ b/StuMgmClient/StudentTree.cs
@@ -23,7 +23,7 @@ namespace StuMgmClient
         private void StudentTree_Load(object sender, EventArgs e)
         {
             db = SystemCtrl.GetTable();
-           allCourseStatus= SystemData.StreeCourseStatus();
+            allCourseStatus= SystemData.StreeCourseStatus();
             dgvStudent.Visible = false;
             BindRoot();
             //da.GetNodesDic(table);
diff --git a/StuMgmClient/SystemData.cs b/StuMgmClient/SystemData.cs
index 836c5f4..00022fb 100644
--- a/StuMgmClient/SystemData.cs
+++ b/StuMgmClient/SystemData.cs
@@ -1,5 +1,4 @@
 using System;
-using System.Collections.Generic;
 using System.Text;
 using StuMgmLib.MyNameSpace;
 using System.Linq;
@@ -7,6 +6,7 @@ using System.Data;
 using System.ComponentModel;
 using System.Collections;
 using System.Reflection;
+using System.Collections.Generic;
 namespace StuMgmClient
 {
     class SystemData
@@ -26,7 +26,7 @@ namespace StuMgmClient
         {
             ErrCode err;
             //List<CourseInfo> 
-            courseInfo = new List<CourseInfo>(); ;
+            courseInfo = new List<CourseInfo>();
             err = SystemCtrl.GetCourseInfo(out courseInfo);
             if (err != ErrCode.Success)
                 return err;
@@ -85,7 +85,7 @@ namespace StuMgmClient
      
         //    if (allCourseStatus.TryGetValue(info.Id, out sel))
         //        return sel;
-
+        
         //    UserCourseDetail m = new UserCourseDetail();
         //    //info->m                                                           
 
@@ -133,8 +133,6 @@ namespace StuMgmClient
             dt.Columns.Add("Pid", typeof(int));
             dt.Columns.Add("Content", typeof(string));
             dt.Columns.Add("Statu", typeof(int));
-            dt.Columns.Add("FirstNode", typeof(int));
-            dt.Columns.Add("SecondNode", typeof(int));
             for (int i = 0; i < list.Count; i++)
             {
                 DataRow dr = dt.NewRow();