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Updating Data with SqlDataAdapter and DataSet

using System; using System.Data;             using System.Data.SqlClient;   using System.Collections.Generic; using System.Text;   class Program   {     static void Main(string[] args)     {       SqlConnection thisConnection = new SqlConnection(                 @"Data Source=.\SQLEXPRESS;" +                 @"AttachDbFilename='NORTHWND.MDF';" +                 @"Integrated Security=True;Connect Timeout=30;User Instance=true");       SqlDataAdapter thisAdapter = new SqlDataAdapter("SELECT CustomerID, CompanyName FROM Customers", thisConnection);       SqlCommandBuilder thisBuilder = new SqlCommandBuilder(thisAdapter);       DataSet thisDataSet = new DataSet();       thisAdapter.Fill(thisDataSet, "Customers");       Console.WriteLine("name before change: {0}",thisDataSet.Tables["Customers"].Rows[9]["CompanyName"]);       thisDataSet.Tables["Customers"].Rows[9]["CompanyName"] = "Acme, Inc.";       thisAdapter.Update(thisDataSet, "Customers");       Console.WriteLine("name after change: {0}",thisDataSet.Tables["Customers"].Rows[9]["CompanyName"]);       thisConnection.Close();     }   }