Updated ReadMe.md

Author: mageshyadavm

README.md

@@ -1,2 +1,87 @@
-# xamarin-listview-loadmore
-Sample Application which showcases the usage of load more option in Xamarin.Forms ListView
+# Processing Xamarin ListView with LoadMore in MVVM
+
+ListView supports binding the [LoadMoreOption](https://help.syncfusion.com/cr/cref_files/xamarin/Syncfusion.SfListView.XForms~Syncfusion.ListView.XForms.SfListView~LoadMoreOption.html), [LoadMoreCommand](https://help.syncfusion.com/cr/cref_files/xamarin/Syncfusion.SfListView.XForms~Syncfusion.ListView.XForms.SfListView~LoadMoreCommand.html), and [IsBusy](https://help.syncfusion.com/cr/cref_files/xamarin/Syncfusion.SfListView.XForms~Syncfusion.ListView.XForms.SfListView~IsBusy.html) properties from view model to load more number of items at runtime. `LoadMoreOption` enables load more manually or automatically when loading the items at runtime. `LoadMoreCommand` executes to load the items form view model. The `IsBusy` property notifies that the items are populating from view model to show or hide the load more view.
+
+The IsBusy property in view model shows the busy indicator when populating the [ItemsSource](https://help.syncfusion.com/cr/cref_files/xamarin/Syncfusion.SfListView.XForms~Syncfusion.ListView.XForms.SfListView~ItemsSource.html).
+
+```
+<syncfusion:SfListView x:Name="listView"                            
+                        LoadMoreOption="Auto"
+                        LoadMoreCommand="{Binding LoadMoreItemsCommand}"
+                        LoadMoreCommandParameter="{Binding Source={x:Reference Name=listView}}"
+                        IsBusy="{Binding IsBusy}"
+                        ItemsSource="{Binding BookInfoCollection}">
+```
+
+```
+public class ViewModel:INotifyPropertyChanged
+{
+    private bool isBusy;
+    public bool IsBusy
+    {
+        get { return isBusy; }
+        set
+        {
+            this.isBusy = value;
+            RaisePropertyChanged("IsBusy");
+        }
+    }
+    private int totalItems = 22;
+    public Command<object> LoadMoreItemsCommand { get; set; }
+
+    public ViewModel()
+    {
+        BookInfoCollection = new ObservableCollection<BookInfo>();
+        AddBookInfos(0, 3);
+        LoadMoreItemsCommand = new Command<object>(LoadMoreItems);
+    }
+
+    private bool CanLoadMoreItems(object obj)
+    {
+        if (BookInfoCollection.Count >= totalItems)
+            return false;
+        return true;
+    }
+
+    private async void LoadMoreItems(object obj)
+    {
+        var listview = obj as Syncfusion.ListView.XForms.SfListView;
+        try
+        {
+            IsBusy = true;
+
+            await Task.Delay(1000);
+
+            var index = BookInfoCollection.Count;
+            var count = index + 3 >= totalItems ? totalItems - index : 3;
+            AddBookInfos(index, 3);
+
+        }
+        catch
+        {
+
+        }
+        finally
+        {
+            IsBusy = false;
+        }
+    }
+
+    private void AddBookInfos(int index, int count)
+    {
+        int bookNameCount = 0;
+        int bookDescriptionCount = 0;
+        for (int i = index; i < index + count; i++)
+        {
+            if (bookNameCount == 11)
+                bookNameCount = 0;
+            if (bookDescriptionCount == 11)
+                bookDescriptionCount = 0;
+            BookInfoCollection.Add(new BookInfo() { BookName = bookNames[bookNameCount] , BookDescription =  bookDescription[bookDescriptionCount] });
+            bookNameCount++;
+            bookDescriptionCount++;
+        }
+    }
+}
+```
+You can also refer our UG documentation to know more about [MVVM](https://help.syncfusion.com/xamarin/sflistview/mvvm).