title: C# Entity Framework and refreshing listBox after insert
body: <p>i have a problem with this code:</p>
  
  <pre><code>public partial class KnihovnyForm : Form
  {
      DatabazeEntities db;
  
      public KnihovnyForm()
      {
          InitializeComponent();
  
          db = new DatabazeEntities();
  
          knihovnyListBox.DataSource = db.Knihovny;
          knihovnyListBox.DisplayMember = "Nazev";
      }
  
      protected override void OnFormClosed(FormClosedEventArgs e)
      {
          base.OnFormClosed(e);
          db.Dispose();
      }
  
  
      private void novaButton_Click(object sender, EventArgs e)
      {
          string text = "";
          if (InputForm.ShowDialog("Název nové knihovny", ref text) == DialogResult.OK)
          {
              Knihovna n = new Knihovna() { Nazev = text };
              db.AddToKnihovny(n);
              db.SaveChanges();
  
              CurrencyManager cm = (CurrencyManager)BindingContext[db.Knihovny];
              cm.Refresh();
          }
      }
  }
  </code></pre>
  
  <p>When I add new item to database, i want to show it in the listBox. But it looks like the Entity Framework don't update context or something like that. If i close this form and open it again all items (including the new one) are show correctly. How can I show all items immediately after insert?</p>
  
  <p>Sorry for my english and some Czech words in code. (Dictionary: Knihovny -> Bookcase, Nazev -> Name)</p>