数据表添加到数据集

我需要为数据集设置一个表

DataSet ds = EventDal.GetEvents(); DataSet dsReturn = new DataSet(); DataTable dtReturn = dsReturn.Tables.Add(); dtReturn.Columns.Add("id"); dtReturn.Columns.Add("description"); dtReturn.Columns.Add("status"); foreach (DataRow row in ds.Tables[0].Rows) { if(Convert.ToInt32(row[1]) == status ) { DataRow newrowdata = dtReturn.NewRow(); dsReturn.Tables["dtReturn"].ImportRow((row));///i'm getting object ref not set to an instance of object.. //DataRow drReturn = dtReturn.NewRow(); //dsReturn.Tables["dtReturn"].Rows.Add(row); } } return dsReturn; 

Answer 1

 DataSet customerOrders = new DataSet("CustomerOrders"); DataTable ordersTable = customerOrders.Tables.Add("Orders"); DataColumn pkOrderID = ordersTable.Columns.Add("OrderID", typeof(Int32)); ordersTable.Columns.Add("OrderQuantity", typeof(Int32)); ordersTable.Columns.Add("CompanyName", typeof(string)); ordersTable.PrimaryKey = new DataColumn[] { pkOrderID };