public DataSet BulidDataSet()        {            DataSet ds=new DataSet();            DataTable dt = new DataTable();            DataColumn col = new DataColumn("姓名",typeof(string));            col.MaxLength = 20;            dt.Columns.Add(col);                   //注意是dt.columns 然后ADD            DataColumn col1 = new DataColumn("年龄", typeof(int));            col.MaxLength = 20;            dt.Columns.Add(col1);            DataRow rw =dt.NewRow();          //给DT增加一个新行对象            rw["姓名"] = "aking";            rw["年龄"] = 26;            dt.Rows.Add(rw);                         //   dt.Rows.Add(dt.NewRow());   增加一个空            DataRow rw1 = dt.NewRow();            rw1["姓名"] = "yao";            rw1["年龄"] = 26;            dt.Rows.Add(rw1);            DataRow rw2 = dt.NewRow();            rw2["姓名"] = "Ayao";            rw2["年龄"] = 26;            dt.Rows.Add(rw2);            ds.Tables.Add(dt);            return ds;        }    更有逻辑性如下 DataSet ret=new DataSet(); DataTable dt=new DataTable(); dt.Columns.Add(new DataColumn("ID",Type.GetType("System.Int32"))); dt.Columns.Add(new DataColumn("Name",Type.GetType("System.Strig"))); //到这一个dt已经建完 //下面就要添加数据

DataRow rw1 = dt.NewRow(); rw1["ID"] = "yao"; rw1["Name"] = "aking"; dt.Rows.Add(rw1);