ListBox binding with ViewModel in WPF

Question

I am new to the WPF and trying to build a sample application using the MVVM framework. My application has a xaml file which has some textboxes for inputing customer info, combo box for display of states and a save button. All the databinding is done through ViewModel(CustomerViewMode) which has a reference to the Model(Customer), containing the required fields and their Getter, setters. The viewModel has a CustomerList property. On clicking the save button, I want to display the FirstName and LastName properties of Customer in a ListBox. This is where the problem is. I debugged the code, (Click event of button in the code behind), I can see that the CustomerList has the first Customer object with all its details, but its not getting displayed in the listbox. My code is: Customer(Model);

enter code here
namespace SampleMVVM.Models
{
class Customer : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private String _firstName;
    private String _lastName;
    private Address _customerAddress;


    public String FirstName
    {
        get { return _firstName; }
        set
        {
            if (value != _firstName)
            {
                _firstName = value;
                RaisePropertyChanged("FirstName");
            }
        }
    }

    public String LastName
    {
        get { return _lastName; }
        set
        {
            if (value != _lastName)
            {
                _lastName = value;
                RaisePropertyChanged("LastName");
            }
        }
    }

    public Address CustomerAddress
    {
        get { return _customerAddress; }
        set
        {
            if (value != _customerAddress)
            {
                _customerAddress = value;
                RaisePropertyChanged("CustomerAddress");
            }
        }
    }

    private void RaisePropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }


}

}

Address(Model)

namespace SampleMVVM.Models
{
class Address : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;
    private string _addressLine1;
    private string _addressLine2;
    private string _city;
    //private string _selectedState;
    private string _postalCode;
    private string _country;






    public String AddressLine1
    {
        get { return _addressLine1; }
        set
        {
            if (value != _addressLine1)
            {
                _addressLine1 = value;
                RaisePropertyChanged(AddressLine1);
            }
        }
    }

    public String AddressLine2
    {
        get { return _addressLine2; }
        set
        {
            if (value != _addressLine2)
            {
                _addressLine2 = value;
                RaisePropertyChanged(AddressLine2);
            }
        }
    }

    public String City
    {
        get { return _city; }
        set
        {
            if (value != _city)
            {
                _city = value;
                RaisePropertyChanged(City);
            }
        }
    }




    public String PostalCode
    {
        get { return _postalCode; }
        set
        {
            if (value != _postalCode)
            {
                _postalCode = value;
                RaisePropertyChanged(PostalCode);
            }
        }
    }

    public String Country
    {
        get { return _country; }
        set
        {
            if (value != _country)
            {
                _country = value;
                RaisePropertyChanged(Country);
            }
        }
    }

    private void RaisePropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }
}

}

CustomerViewModel:

namespace SampleMVVM.ViewModels
{
class CustomerViewModel : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;

    private Customer _customer;
    RelayCommand _saveCommand;
    private List<String> _stateList = new List<string>();
    private string _selectedState;

    private ObservableCollection<Customer> _customerList = new ObservableCollection<Customer>();


    //public CustomerViewModel(ObservableCollection<Customer> customers)
    //{
    //    _customers = new ListCollectionView(customers);

    //}



    public Customer CustomerModel
    {
        get { return _customer; }
        set
        {
            if (value != _customer)
            {
                _customer = value;
                RaisePropertyChanged("CustomerModel");
            }
        }
    }

    public List<String> StateList
    {
        get
        {

            return _stateList;
        }
        set { _stateList = value; }

    }

    public ObservableCollection<Customer> CustomerList
    {
        get
        {

            return _customerList;
        }
        set
        {
            if (value != _customerList)
            {
                _customerList = value;
                RaisePropertyChanged("CustomerList");
            }

        }

    }


    public CustomerViewModel()
    {
        CustomerModel = new Customer
        {
            FirstName = "Fred",
            LastName = "Anders",

            CustomerAddress = new Address
            {
                AddressLine1 = "Northeastern University",
                AddressLine2 = "360, Huntington Avenue",
                City = "Boston",
                PostalCode = "02115",
                Country = "US",


            }
        };

        StateList = new List<String>
        {
            "Alaska", "Arizona", "California", "Connecticut", "Massachusetts", "New Jersey", "Pennsylvania", "Texas"
        };
        SelectedState = StateList.FirstOrDefault();


    }

    public String SelectedState
    {
        get { return _selectedState; }
        set
        {
            if (value != _selectedState)
            {
                _selectedState = value;
                RaisePropertyChanged(SelectedState);
            }
        }
    }

    private void RaisePropertyChanged(string propertyName)
    {
        var handler = PropertyChanged;
        if (handler != null)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }

        }

}

CustomerInfo.xaml(view)

<UserControl x:Class="SampleMVVM.Views.CustomerInfo"
         xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
         xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:ViewModels="clr-namespace:SampleMVVM.ViewModels"             
         mc:Ignorable="d" 
         d:DesignHeight="300" d:DesignWidth="300">

<UserControl.DataContext>
    <ViewModels:CustomerViewModel />
</UserControl.DataContext>



<Grid>
    <Grid.ColumnDefinitions>
        <ColumnDefinition />
        <ColumnDefinition />
    </Grid.ColumnDefinitions>
    <Grid.RowDefinitions>
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
        <RowDefinition />
    </Grid.RowDefinitions>


    <!--Starting label-->
    <TextBlock FontSize="18" FontFamily="Comic Sans MS" FontWeight="ExtraBlack" 
               Foreground="Navy" 
               Grid.Row="0" HorizontalAlignment="Center">
        <TextBlock.Text>
            Customer Information:
        </TextBlock.Text>
    </TextBlock>

    <TextBlock Text="First name: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
               Grid.Row="1" Width="80px" Height="50px" Margin="40,5,0,0"/>
    <TextBox Text="{Binding CustomerModel.FirstName}" Grid.RowSpan="2" HorizontalAlignment="Left" 
             VerticalAlignment="Top"
             Grid.Row="1" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"  Name="fname"/>

    <TextBlock Text="Last Name: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
               Grid.Row="2" Width="80px" Height="50px" Margin="40,5,0,0"/>
    <TextBox Text="{Binding CustomerModel.LastName}" Grid.RowSpan="2" HorizontalAlignment="Left" 
             VerticalAlignment="Top"
             Grid.Row="2" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0" Name="lname"/>

    <TextBlock Text="Address: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
               Grid.Row="3" Width="80px" Height="50px" Margin="40,5,0,0"/>
    <TextBox Text="{Binding CustomerModel.CustomerAddress.AddressLine1}" Grid.RowSpan="2" HorizontalAlignment="Left" 
             VerticalAlignment="Top"
             Grid.Row="3" Grid.Column="1" Width="160px" Height="20px" Margin="20,5,0,0"/>
    <TextBox Text="{Binding CustomerModel.CustomerAddress.AddressLine2}" Grid.RowSpan="2" HorizontalAlignment="Left" 
             VerticalAlignment="Top"
             Grid.Row="4" Grid.Column="1" Width="160px" Height="30px" Margin="20,5,0,0"/>

    <TextBlock Text="City: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
               Grid.Row="5" Width="80px" Height="20px" Margin="40,5,0,0"/>
    <TextBox Text="{Binding CustomerModel.CustomerAddress.City}" Grid.RowSpan="2" HorizontalAlignment="Left" 
             VerticalAlignment="Top"
             Grid.Row="5" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"/>

    <TextBlock Text="State: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
               Grid.Row="6" Width="80px" Height="20px" Margin="40,5,0,0"/>
    <ComboBox Grid.RowSpan="2" HorizontalAlignment="Left" Name="listOfSates"
              VerticalAlignment="Top" 
              Grid.Row="6" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"
              ItemsSource="{Binding Path=StateList}" 
              SelectedItem="{Binding Path=SelectedState}"
              SelectionChanged="ComboBox_SelectionChanged"
              >


    </ComboBox>

    <TextBlock Text="PostalCode: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
               Grid.Row="7" Width="80px" Height="20px" Margin="40,5,0,0"/>
    <TextBox Text="{Binding CustomerModel.CustomerAddress.PostalCode}"  Grid.RowSpan="2" HorizontalAlignment="Left" 
             VerticalAlignment="Top"
             Grid.Row="7" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"/>

    <TextBlock Text="Country: " Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
               Grid.Row="8" Width="80px" Height="20px" Margin="40,5,0,0"/>
    <TextBox Text="{Binding CustomerModel.CustomerAddress.Country}" Grid.RowSpan="2" HorizontalAlignment="Left" 
             VerticalAlignment="Top"
             Grid.Row="8" Grid.Column="1" Width="80px" Height="20px" Margin="20,5,0,0"/>

    <Button Content="Save" Grid.RowSpan="2" HorizontalAlignment="Left" VerticalAlignment="Top"
            Grid.Row="9"  Width="50px" Height="20px" Name="savebtn" Margin="40,5,0,0"
             Click="savebtn_Click"/>


    <ListBox Name="cList" ItemsSource="{Binding Path=CustomerList}"
             HorizontalAlignment="Left" 
             VerticalAlignment="Top"
             Grid.Row="1" Grid.Column="2" Grid.RowSpan="2" Width="200px" Height="300px" Margin="200,5,0,0">
        <ListBox.ItemTemplate>
            <DataTemplate>
                <StackPanel>
                    <TextBlock Text="{Binding CustomerModel.FirstName}"
                           FontWeight="Bold" Foreground="Navy"/>
                    <TextBlock Text=", " />
                    <TextBlock Text="{Binding CustomerModel.LastName}"
                           FontWeight="Bold" Foreground="Navy"/>
                </StackPanel>
            </DataTemplate>
        </ListBox.ItemTemplate>
    </ListBox>
</Grid>

CustomerInfo(Code behind class)

namespace SampleMVVM.Views
{
/// <summary>
/// Interaction logic for CustomerInfo.xaml
/// </summary>
public partial class CustomerInfo : UserControl
{
    public CustomerInfo()
    {
        InitializeComponent();

        //checkvalue();
    }

            private void savebtn_Click(object sender, RoutedEventArgs e)
    {
        ////Customer c = new Customer();
        ////c.FirstName = fname.Text;
        ////c.LastName = lname.Text;
        //CustomerViewModel cvm = new CustomerViewModel();
        //cvm.CustomerModel.FirstName = fname.Text;
        //cvm.CustomerModel.LastName = lname.Text;
        //List<CustomerViewModel> customerList = new List<CustomerViewModel>();
        //customerList.Add(cvm);
        var viewModel = DataContext as CustomerViewModel;


        if (viewModel != null)
        {

            //viewModel.ShowCustomerInfo();
            String strfname = viewModel.CustomerModel.FirstName;
            String strname = viewModel.CustomerModel.LastName;

            viewModel.CustomerList.Add(viewModel.CustomerModel);
            String str1 = viewModel.CustomerList.FirstOrDefault().FirstName;
            int i = viewModel.CustomerList.Count();
            //cList.ItemsSource = viewModel.CustomerList;

        }

    }

    private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
    {
        CustomerViewModel cvm = new CustomerViewModel();
        cvm.SelectedState = listOfSates.SelectedItem.ToString();
    }




}

}

I just cant understand where am I going wrong...Someone please help

Answer 1

And for the correct binding in ListBox.ItemTemplate:

<TextBlock Text="{Binding FirstName}"
           FontWeight="Bold" Foreground="Navy"/>
<TextBlock Text="{Binding LastName}"
           FontWeight="Bold" Foreground="Navy"/>

The DataContext of ListBoxItem is a Customer already.