C#

private static bool StopThread = false;

private void Form1_Load(object sender, EventArgs e)
{

   System.Threading.Thread local_Thread = new System.Threading.Thread(RunThread);
   local_Thread.Start();

   System.Windows.Forms.Form local_Form = new System.Windows.Forms.Form();
   local_Form.MdiParent = this;
   local_Form.Show();

}

private void RunThread()
{

   System.Data.SqlClient.SqlConnection local_SqlConnection = new System.Data.SqlClient.SqlConnection();
   System.Data.SqlClient.SqlCommand local_SqlCommand = new System.Data.SqlClient.SqlCommand();
   System.Data.SqlClient.SqlDataReader local_SqlDataReader;
   local_SqlConnection.ConnectionString = @"Data Source=MyServer\MyInstance;Initial    Catalog=master;Integrated Security=true;";
   local_SqlConnection.Open();

   while (!StopThread)
   {

      // Command Object setzen
      local_SqlCommand.CommandText = "SELECT * FROM SomeTable";
      local_SqlCommand.CommandTimeout = 0;
      local_SqlCommand.Connection = local_SqlConnection;

      // DataReader
      local_SqlDataReader = local_SqlCommand.ExecuteReader();

      // DataTable füllen
      System.Data.DataTable local_DataTable = new System.Data.DataTable();
      local_DataTable.BeginLoadData();
      local_DataTable.Load(local_SqlDataReader);
      local_DataTable.EndLoadData();

      System.Threading.Thread.Sleep(2000);
   }

}

private void Form1_FormClosing(object sender, FormClosingEventArgs e)
{ StopThread = true; }