Updated the README.md file

README.md

@@ -1 +1,65 @@
 **[View document in Syncfusion Xamarin Knowledge base](https://www.syncfusion.com/kb/12095/how-to-update-empty-group-header-text-in-xamarin-forms-listview-sflistview)**
+
+## Sample
+
+```xaml
+<syncfusion:SfListView x:Name="listView" ItemSize="60" ItemsSource="{Binding ContactsInfo}">
+    <syncfusion:SfListView.ItemTemplate >
+        <DataTemplate>
+            <code>
+            . . .
+            . . .
+            <code>
+        </DataTemplate>
+    </syncfusion:SfListView.ItemTemplate>
+    <syncfusion:SfListView.GroupHeaderTemplate>
+        <DataTemplate>
+            <code>
+            . . .
+            . . .
+            <code>
+        </DataTemplate>
+    </syncfusion:SfListView.GroupHeaderTemplate>
+</syncfusion:SfListView>
+
+C#:
+ListView.DataSource.GroupDescriptors.Add(new GroupDescriptor()
+{
+    PropertyName = "Group",
+    KeySelector = (object obj1) =>
+    {
+        var item = (obj1 as Contacts);
+        return item.Group;
+    },
+});
+ListView.QueryItemSize += ListView_QueryItemSize;
+
+private void ListView_QueryItemSize(object sender, QueryItemSizeEventArgs e)
+{
+    if (e.ItemType == ItemType.Record && (e.ItemData as Contacts).ContactName == "")
+    {
+        e.ItemSize = 0;
+        e.Handled = true;
+    }
+}
+
+Converter:
+public class GroupHeaderConverter : IValueConverter
+{
+    public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        if (value == null) return null;
+
+        var groupResult = value as GroupResult;
+        if (groupResult.Key.ToString() == "WORK")
+            return groupResult.Count > 1 ? "WORK" : "EMPTY WORK";
+        else
+            return groupResult.Count > 1 ? "PERSONAL" : "EMPTY PERSONAL";
+    }
+
+    public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
+    {
+        throw new NotImplementedException();
+    }
+}
+```