Merge pull request #4 from Anandh-SF4665/master

Updated the README.md file

Author: PiruthivirajM

README.md

@@ -2,6 +2,84 @@
 
 This example demonstrates how to notify item selection using MVVM in Xamarin.Forms listview.
 
+## Sample
+
+```xaml
+<Grid>
+    <listView:SfListView x:Name="listView" ItemSize="70" ItemSpacing="0,0,5,0"
+                    ItemsSource="{Binding contactsinfo}" IsStickyHeader="True" TapCommand="{Binding }"
+                    SelectionMode="Multiple" IsStickyGroupHeader="True" GroupHeaderSize="50">
+                <listView:SfListView.Behaviors>
+                    <local:EventToCommandBehavior EventName="SelectionChanged" 
+                                        Command="{Binding SelectionChangedCommand}"
+                                        Converter="{StaticResource EventArgs}" />
+                </listView:SfListView.Behaviors>
+        <listView:SfListView.ItemTemplate>
+            <DataTemplate>
+                <ViewCell>
+                    <ViewCell.View>
+                        <Grid x:Name="grid" RowSpacing="1">
+                            <code>
+                            . . .
+                            . . .
+                            <code>
+                        </Grid>
+                    </ViewCell.View>
+                </ViewCell>
+            </DataTemplate>
+        </listView:SfListView.ItemTemplate>
+    </listView:SfListView>
+</Grid>
+
+ViewModel.cs:
+Command<object> selectionChangedCommand;
+
+public Command<object> SelectionChangedCommand
+{
+    get { return selectionChangedCommand; }
+    protected set { selectionChangedCommand = value; }
+}
+
+public ObservableCollection<Contacts> contactsinfo { get; set; }
+
+public ContactsViewModel()
+{
+    selectionChangedCommand = new Command<object>(OnSelectionChanged);
+    contactsinfo = new ObservableCollection<Contacts>();
+    Random r = new Random();
+    foreach (var cusName in CustomerNames)
+    {
+        var contact = new Contacts(cusName, r.Next(720, 799).ToString() + " - " + r.Next(3010, 3999).ToString());
+        contact.ContactImage = ImageSource.FromResource("PassItemData.Images.Image" + r.Next(0, 28) + ".png");
+        contactsinfo.Add(contact);
+    }
+}
+
+public void OnSelectionChanged(object obj)
+{
+    var eventArgs = obj as ItemSelectionChangedEventArgs;
+
+    for (int i = 0; i < eventArgs.RemovedItems.Count; i++)
+    {
+        var item = eventArgs.RemovedItems[i] as Contacts;
+        if (item.IsSelected)
+        {
+            item.IsSelected = false;
+            App.Current.MainPage.DisplayAlert("Message", "Item removed from selected item", "ok");
+        }
+    }
+    for (int i = 0; i < eventArgs.AddedItems.Count; i++)
+    {
+        var item = eventArgs.AddedItems[i] as Contacts;
+        if (!item.IsSelected)
+        {
+            item.IsSelected = true;
+            App.Current.MainPage.DisplayAlert("Message", "Item added into selected item", "ok");
+        }
+    }
+}
+```
+
 See [How to notify item selection using MVVM in Xamarin.Forms ListView](https://www.syncfusion.com/kb/9961/how-to-notify-item-selection-using-mvvm-in-xamarin-forms-listview) for more details.
 
 ## Requirements to run the demo