Binding List to a ComboBox in WPF using MVVM

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WPF

I am trying to read the values of a column from a database table, store those values as a

List<string>

and bind it to a combobox in WPF using MVVM.

Although the values are read from the database and stored in a

List<string>

, the ComboBox does not display it as a dropdown.

I have been stuck with this problem for 2 days.
Any Help would be truely appreciated.

Here is my code:

ViewModel.cs:

private List<string> myComboBoxData =null;

        public List<string> MyComboBoxData
        {
           get
           {
               return this.myComboBoxData ;
           }
           set
           {
               this.myComboBoxData = value;
               base.OnPropertyChanged("MyComboBoxData ");
           }
        }

        public ViewModel(UserDetails view)
        {
            this.view = view;
            view.DataContext = this;
            getmyComboBoxData();
        }

        private void getmyComboBoxData()
        {
          using (myEntities context = new myEntities())
            {
                myComboBoxData = (from utype in context.usertypes
                           select utype.TypeName).ToList<string>();
            }
        }

View.xaml:

<ComboBox  ItemsSource="{Binding MyComboBoxData}" Height="23" HorizontalAlignment="Left" Margin="150,91,0,0" Name="mycomboBox" VerticalAlignment="Top" Width="120" />