• Download and Install WPFToolkit from WPFToolkit
  • Drag and Drop “AutoCompleteBox” from toolbox, if for any reason it is not appearing in the toolbox you can create a tab in toolbox and add choose items System.Windows.Controls.*.Toolkit or you can create the control following steps
    • Add as a reference following dlls, actual location may vary according to location C:\Program Files (x86)\WPF Toolkit\v3.5.50211.1\WPFToolkit.dll C:\Program Files (x86)\WPF Toolkit\v3.5.50211.1\System.Windows.Controls.Input.Toolkit.dll
    • Add reference to assembly in XAML window tag
  • Add the control
        <my:AutoCompleteBox Name="autoCompleteBox1"  Width="213" Height="25" Populating="autoCompleteBox1_Populating" />
  • In populating event get the desired options from service/database and bind to the AutoCompleteBox. Calling PopulateComplete() is important as it tells the box that items that need to be populated have been binded.
      private void autoCompleteBox1_Populating(object sender, PopulatingEventArgs e)
            var options = new List() { "one", "two", "three" };
            autoCompleteBox1.ItemsSource = options;