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<Window xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:WpfCombo"
        Title="Combobox example"
        WindowStyle="ToolWindow"
        Width="300"
        Height="150">

  <Window.Resources>
    <local:ComboSource x:Key="languages">
      <local:ComboData DisplayValue="C#" ItemValue="1" />
      <local:ComboData DisplayValue="F#" ItemValue="2" />
      <local:ComboData DisplayValue="Java" ItemValue="3" />
    </local:ComboSource>
  </Window.Resources>

  <StackPanel>
    <ComboBox Width="100"
              ItemsSource="{Binding Source={StaticResource ResourceKey=languages}}"
              DisplayMemberPath="DisplayValue"
              SelectedValuePath="ItemValue"
              SelectedValue="{Binding Path=ProgramLanguage}"
              />
  </StackPanel>
</Window>

namespace WpfCombo
{
  using System;
  using System.Collections.Generic;
  using System.Collections.ObjectModel;
  using System.Linq;

  class ComboSource : ObservableCollection<ComboData>
  {

  }

  class ComboData
  {
    public string DisplayValue { get; set; }
    public string ItemValue    { get; set; }
  }
}