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Update SqlDataAdapter with DataSet

using System; using System.Data; using System.Data.SqlClient; class MainClass {    static void Main(string[] args)    {       string connString = @"server = .\sqlexpress;integrated security = true;database = northwind";       string qry = @"select * from employees where country = 'UK'";       SqlConnection conn = new SqlConnection(connString);       try       {          SqlDataAdapter da = new SqlDataAdapter();          da.SelectCommand = new SqlCommand(qry, conn);          SqlCommandBuilder cb = new SqlCommandBuilder(da);          DataSet ds = new DataSet();          da.Fill(ds, "employees");          DataTable dt = ds.Tables["employees"];          DataRow newRow = dt.NewRow();          newRow["firstname"] = "R";          newRow["lastname"] = "B";          newRow["titleofcourtesy"] = "Sir";          newRow["city"] = "B";          newRow["country"] = "UK";          dt.Rows.Add(newRow);          foreach (DataRow row in dt.Rows)          {             Console.WriteLine(                "{0} {1} {2}",                row["firstname"].ToString().PadRight(15),                row["lastname"].ToString().PadLeft(25),                row["city"]);          }          da.Update(ds, "employees");       }       catch(Exception e)       {          Console.WriteLine("Error: " + e);       }       finally       {          conn.Close();       }    } }