【C#winform源码实例】datagrid显示主细表

    protected  void BindtoDataGrid()
        ...{ 
            
            
            string sql=@"";//blog.youkuaiyun.com/jbgh608
            string ssql=@"";
            DataSet ds = new DataSet();
            DataTable tb=new DataTable();
            tb=GetDataTable(sql);
            tb.TableName="记录";
            ds.Tables.Add(tb);
            tb=null;
            tb=GetDataTable(ssql);
            tb.TableName="明细记录";
            ds.Tables.Add(tb);
            tb=null;
            ds.Relations.Add("明细",ds.Tables["记录"].Columns["id"],
                ds.Tables["记录"].Columns["id"]);
            dataGrid1.SetDataBinding(ds,"记录");                    
        
            dataGrid2.DataSource=dataGrid1.DataSource;
        }
        public static   DataTable GetDataTable(string  commandText)
        ...{
            string connection ="server=ORADB;uid=jbgh608;pwd=jbgh608;";
            OracleConnection con = new OracleConnection(connection);
            OracleCommand cmd=new OracleCommand(commandText,con);
            OracleDataAdapter adapter = new OracleDataAdapter(cmd);
            try
            ...{
                DataTable dt=new DataTable();
                adapter.Fill(dt);
                return dt;
            }
            catch(Exception err)
            ...{
                throw new Exception(err.Message);
            }
            finally
            ...{ 
                cmd.Dispose();
                cmd=null;
                adapter.Dispose();
                adapter=null;
            }
        }