Inserting new row into a DataTable available in Dataset without using SQL Queries

cn = new SqlConnection("Server=Dbserver2;Database=NorthWind;User Id=sa;Password=bit");

da = new SqlDataAdapter("Select * from Categories",cn);

ds = new DataSet();

da.Fill(ds,"Categories");

da.TableMappings.Add("Table","Categories");

SqlCommandBuilder cb = new SqlCommandBuilder(da);

DataRow dr = ds.Tables[0].NewRow() ;

dr["CategoryName"] = "testbyGan";

dr["Description"]="Some Time";

ds.Tables[0].Rows.Add(dr);

da.Update(ds,"Categories");