Table的聚合函数
Compute （表达式，条件）中简单的聚合函数
string strSumAccount = myDs.Tables[0].Compute("SUM(AccountMoney（列）)", "").ToString();  计算datatable的列的总和

分页
PagedDataSource pds = new PagedDataSource();
                pds.DataSource = myDataSet.Tables[0].DefaultView;
                pds.PageSize = 4;
                pds.AllowPaging = true;

datatable 视图的排序
   DirectoryOneDt.DefaultView.Sort = "SortCode";
                DirectoryOneDt = DirectoryOneDt.DefaultView.ToTable();