Sample

<sync:SfListViewx:Name="listView"ItemSize="70"FocusBorderThickness="0"SelectionBackgroundColor="#ECECEC"IsScrollBarVisible="False"ItemsSource="{Binding ContactsInfo}">        <sync:SfListView.DataSource>        <dataSource:DataSource>            <dataSource:DataSource.SortDescriptors>                <dataSource:SortDescriptor>                    <dataSource:SortDescriptor.Comparer>                        <local:CustomSortComparer/>                    </dataSource:SortDescriptor.Comparer>                </dataSource:SortDescriptor>            </dataSource:DataSource.SortDescriptors>        </dataSource:DataSource>    </sync:SfListView.DataSource>        <sync:SfListView.ItemTemplate>        <DataTemplate>            <ViewCell>                <ViewCell.View>                    <code>                    . . .                    . . .                    <code>                </ViewCell.View>            </ViewCell>        </DataTemplate>    </sync:SfListView.ItemTemplate></sync:SfListView>CustomSortComparer:public class CustomSortComparer : IComparer<object>{    public int Compare(object x, object y)    {        if (x.GetType() == typeof(ListViewContactsInfo))        {            var xitem = (x as ListViewContactsInfo).ContactName;            var yitem = (y as ListViewContactsInfo).ContactName;            if (xitem.Length > yitem.Length)            {                return 1;            }            else if (xitem.Length < yitem.Length)            {                return -1;            }            else            {                if (string.Compare(xitem, yitem) == -1)                    return -1;                else if (string.Compare(xitem, yitem) == 1)                    return 1;            }        }        return 0;    }}