WPF Finding Selected ComboBox Item Within DataGrid

Question

Hi all... I'm having an issue trying to access the selected item value in a ComboBox within a DataGridTemplateColumn. 
Through another question/answer I have got the ComboBox displaying the names as it should but the next step I'm having issues with is to be able to loop through each row in the DataGrid and determine the selected value of the ComboBox in that row as
well as some other items and run some other code based on those values. 
Any help would be appreciated. 
Thanks,
Greg
<Grid>
<DataGrid x:Name="gvDefaultCWWSchedule" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Margin="10,109,10,214" AutoGenerateColumns="False" Grid.Row="0"
AllowDrop="True" IsReadOnly="False" SelectionMode="Single" Background="Beige" CanUserAddRows="False">
<DataGrid.Columns>
<DataGridTemplateColumn Width="150">
<DataGridTemplateColumn.CellTemplate>
<DataTemplate>
<ComboBox Name="ddlUsers"
ItemsSource="{Binding Path=Users}"
DisplayMemberPath="{Binding Name, Mode=TwoWay}"
SelectedValuePath="{Binding Uid, Mode=TwoWay}"
SelectedIndex="{Binding Uid, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}"
SelectionChanged="ComboBox_SelectionChanged"
>
<ComboBox.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal">
<TextBlock Text="{Binding Name}" />
</StackPanel>
</DataTemplate>
</ComboBox.ItemTemplate>
</ComboBox>
</DataTemplate>
</DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
<DataGridTextColumn Binding="{Binding WeekNumber}" />
</DataGrid.Columns>
</DataGrid>
<Button Content="Button" HorizontalAlignment="Left" Margin="729,32,0,0" VerticalAlignment="Top" Width="75" Click="Button_Click"/>
</Grid>
public partial class Test : Window
public Test()
InitializeComponent();
BindDefaultCWWSchedule();
private void BindDefaultCWWSchedule()
// THIS IS COMING FROM MY DB
List<CurrentUser> UsersFinal = new List<CurrentUser>();
UsersFinal.Add(new CurrentUser { Uid = 1, Name = "JOHN" });
UsersFinal.Add(new CurrentUser { Uid = 2, Name = "BILL" });
UsersFinal.Add(new CurrentUser { Uid = 3, Name = "MARY" });
ObservableCollection<CWWDefaultScheduleWeek> DefaultSchedules = new ObservableCollection<CWWDefaultScheduleWeek>();
DefaultSchedules.Add(new CWWDefaultScheduleWeek { Users = UsersFinal, WeekNumber = 1, SelectedUser = null });
DefaultSchedules.Add(new CWWDefaultScheduleWeek { Users = UsersFinal, WeekNumber = 2, SelectedUser = null });
DefaultSchedules.Add(new CWWDefaultScheduleWeek { Users = UsersFinal, WeekNumber = 3, SelectedUser = null });
DefaultSchedules.Add(new CWWDefaultScheduleWeek { Users = UsersFinal, WeekNumber = 4, SelectedUser = null });
gvDefaultCWWSchedule.ItemsSource = DefaultSchedules;
private void Button_Click(object sender, RoutedEventArgs e)
var rows = gvDefaultCWWSchedule.ItemsSource;
ObservableCollection<CWWDefaultScheduleWeek> CWWSchedAssignments = new ObservableCollection<CWWDefaultScheduleWeek>();
foreach (var row in rows)
CWWDefaultScheduleWeek r = (CWWDefaultScheduleWeek)row;
// FOR EACH ROW HERE I'M WANTING TO CREATE A LIST OF ITEMS AND RUN FURTHER CODE BASED ON IT... ISSUE IS FINDING THE ACTUAL SELECTED USER ON EACH ROW...
CWWSchedAssignments.Add(new CWWDefaultScheduleWeek
Users = r.Users,
SelectedUser = r.SelectedUser,
WeekNumber = r.WeekNumber
private void ComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
gvDefaultCWWSchedule.CommitEdit();
public class CWWDefaultScheduleWeek
public IEnumerable<CurrentUser> Users { get; set; }
public CurrentUser SelectedUser { get; set; }
public int WeekNumber { get; set; }
public class CurrentUser
public int Uid { get; set; }
public string Name { get; set; }

Answer 1

In a way, wpf is similar to web.
More so than windows forms anyhow.
XAML is mark up and flows like html.
You have padding and margin which are rather familiar concepts.
Whereas windows forms is absolute positioning and... well totally different from markup.
You might find this sample interesting as a sort of mvvm taster.
https://gallery.technet.microsoft.com/WPF-Dialler-simulator-d782db17
and event handling equivalents
http://social.technet.microsoft.com/wiki/contents/articles/30564.wpf-uneventful-mvvm.aspx
Note
With a combo you bind the selecteditem to a propfull and then you can put a method call in the setter.  That will then be invoked when the user changes selection.
Good luck and welcome to wpf development.
It's a great technology.
Hope that helps.
Recent Technet articles: Property List Editing;
Dynamic XAML