DataGrid绑定两个DataTable

项目要统计从内网、外网的信息数据，通过WebService查询出外网的数据后，与内网的数据一起绑定到一个DataGrid，
在网上搜索了一下，答案马上就出来了

 1            BusinessFacade.TestQuestion TQ = new TestQuestion ();
 2             DataTable table = new DataTable ();
 3           table.Columns .Add ("Position",typeof(string));
 4           DwService.Service service = new Service ();
 5            DataSet inner= TQ.TestUserGetAll (testpageid,Functions.ToDateTime(starttime),Functions.ToDateTime (endtime) );
 6                    if(inner!=null && inner.Tables [0].Rows .Count >0)
 7                    {
 8                        DataTable innertable = inner.Tables [0];
 9                        innertable.Columns .Add ("Position",typeof(string));
10                        for(int m=0;m<innertable.Rows .Count ;m++)
11                        {
12                            DataRow row = innertable.Rows [m];
13                            row["Position"] = "内网";
14                        }
15                        table = innertable;
16                    }
17                    DataSet outer = service.TestUserGetAll (testpageid,Functions.ToDateTime(starttime),Functions.ToDateTime (endtime) );
18                    if(outer!=null && outer.Tables [0].Rows.Count >0)
19                    {
20                        DataTable outtable = outer.Tables [0];
21                        outtable.Columns .Add ("Position",typeof(string));
22                        DataRow dr;
23                        for(int i=0;i<outtable.Rows .Count ;i++)
24                        {
25                            outtable.Rows [i]["Position"] = "外网";
26                            dr = table.NewRow ();
27                            for(int j=0;j<table.Columns.Count ;j++)
28                            {
29                                dr[j] = outtable.Rows [i][j];
30                            }
31                            table.Rows .Add (dr );
32                        }
33                    }
34      if(table!=null && table.Rows .Count >0)
35                {
36                    DataView daview = table.DefaultView ;
37                    daview.Sort = "starttime desc";
38                    ViewState["table"] = table;
39                    
40                    dgTestUser.DataSource = table;
41                    dgTestUser.DataBind ();
45                    
46                }

 把两个DataTable组合成一个后，用DataView对DataGrid进行排序。