ComboBox binding to ObservableCollection is not working - wpf

Question

I am new to WPF. In existing application,Combo box is not getting binding values from ObservableCollection. I have a class ShipmentItem. I need to bind combo box with WeightUnit field.
below is the code:
public partial class ShipmentItem : DataEntity {
private int piecesField;
private float weightField;
private System.Nullable<float> widthField;
private System.Nullable<float> lengthField;
private System.Nullable<float> heightField;
private string descriptionField;
private WeightUnit weightUnitField;
private LengthUnit lengthUnitField;
public int Pieces {
get {
return this.piecesField;
}
set {
this.piecesField = value;
this.RaisePropertyChanged("Pieces");
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(Order=1)]
public float Weight {
get {
return this.weightField;
}
set {
this.weightField = value;
this.RaisePropertyChanged("Weight");
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=2)]
public System.Nullable<float> Width {
get {
return this.widthField;
}
set {
this.widthField = value;
this.RaisePropertyChanged("Width");
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=3)]
public System.Nullable<float> Length {
get {
return this.lengthField;
}
set {
this.lengthField = value;
this.RaisePropertyChanged("Length");
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(IsNullable=true, Order=4)]
public System.Nullable<float> Height {
get {
return this.heightField;
}
set {
this.heightField = value;
this.RaisePropertyChanged("Height");
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(Order=5)]
public string Description {
get {
return this.descriptionField;
}
set {
this.descriptionField = value;
this.RaisePropertyChanged("Description");
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(Order=6)]
public WeightUnit WeightUnit {
get {
return this.weightUnitField;
}
set {
this.weightUnitField = value;
this.RaisePropertyChanged("WeightUnit");
}
}
/// <remarks/>
[System.Xml.Serialization.XmlElementAttribute(Order=7)]
public LengthUnit LengthUnit {
get {
return this.lengthUnitField;
}
set {
this.lengthUnitField = value;
this.RaisePropertyChanged("LengthUnit");
}
}}
Here is the observable collection :
public ObservableCollection<ShipmentItem> ShipmentItemCollection
{
get { return shipmentItemCollection; }
set { shipmentItemCollection = (ObservableCollection<ShipmentItem>)value; }
}
shipmentItemCollection.Add(new ShipmentItem()
{
Weight = 0,
Pieces = 0,
WeightUnit = WeightUnit.Pounds,
Description = string.Empty,
Length = 0,
Width = 0,
Height = 0,
LengthUnit = LengthUnit.Inches,
Skidded = false,
Stackable = false,
Nmfc = string.Empty,
FreightClass = string.Empty,
DeliveryStop = 0
});
shipmentItemList.ItemsSource = shipmentItemCollection;
shipmentItemList.DataContext = ShipmentItemCollection;
ShipmentItemList is Listview, which has text box and combo box.Text box are getting their values from the binding path except ComboBox.And this is the XAML code for combo box.
<ComboBox Name ="cmbWeightUnits"
SelectionChanged="cmbWeightUnits_SelectionChanged"
PreviewKeyDown="check_PreviewKeyDown"
ItemsSource="{Binding Path= ShipmentItemCollection}"
DisplayMemberPath="{Binding Path=WeightUnit}">
</ComboBox>
Any help would be appreciated.

Answer 1

View
<ComboBox ItemsSource="{Binding ShipmentItemCollection}"
DisplayMemberPath="{Binding Path=WeightUnit}">
</ComboBox>
In the View class, set the DataContext to ViewModel
ViewModel
private ObservableCollection<ShipmentItem> _shipmentItemCollection;
public ObservableCollection<ShipmentItem> ShipmentItemCollection
{
get { return _shipmentItemCollection; }
set { _shipmentItemCollection = value; }
}
continued (in a constructor or some method)
ShipmentItemCollection.Add(new ShipmentItem()
{
Weight = 0,
Pieces = 0,
WeightUnit = WeightUnit.Pounds,
Description = string.Empty,
Length = 0,
Width = 0,
Height = 0,
LengthUnit = LengthUnit.Inches,
Skidded = false,
Stackable = false,
Nmfc = string.Empty,
FreightClass = string.Empty,
DeliveryStop = 0
});