ADO Net C# Tutorial

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(thisDataSet.Tables["Customers"].Rows.Count);
      DataRow thisRow = thisDataSet.Tables["Customers"].NewRow();
      thisRow["CustomerID"] = "1";
      thisRow["CompanyName"] = "ABC Ltd.";
      thisDataSet.Tables["Customers"].Rows.Add(thisRow);
      Console.WriteLine(thisDataSet.Tables["Customers"].Rows.Count);
      thisAdapter.Update(thisDataSet, "Customers");
      thisConnection.Close();
    }
  }