ShareImage.xaml

<phone:PhoneApplicationPage
    x:Class="AdkaarWindowsPhone.ShareImage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    mc:Ignorable="d"
    xmlns:local="clr-namespace:AdkaarWindowsPhone"
    shell:SystemTray.IsVisible="True">
    <phone:PhoneApplicationPage.Resources>


        <local:NullToVisibilityConverter x:Name="StringToVisibiltyConverter" />
        <Style TargetType="TextBlock">
            <Setter Property="Margin" Value="10,0,10,0"></Setter>
            <Setter Property="VerticalAlignment" Value="Stretch"></Setter>
        </Style>
        <Style TargetType="TextBlock" x:Key="DuaText">
            <Setter Property="Foreground" Value="Black"></Setter>
            <Setter Property="VerticalAlignment" Value="Stretch"></Setter>

            <Setter Property="Margin" Value="10,10,10,10"></Setter>
            <Setter Property="TextWrapping" Value="Wrap" ></Setter>
        </Style>

        <Style TargetType="TextBlock" x:Key="DuaTextArabic">
            <Setter Property="Foreground" Value="Black"></Setter>
            <Setter Property="VerticalAlignment" Value="Stretch"></Setter>
            <Setter Property="Margin" Value="10,5,10,5"></Setter>
            <Setter Property="TextWrapping" Value="Wrap" ></Setter>
            <Setter Property="TextAlignment" Value="Right"></Setter>
        </Style>
        <Style TargetType="TextBlock" x:Key="DuaTextMalayalam">
            <Setter Property="Foreground" Value="Black"></Setter>
            <Setter Property="VerticalAlignment" Value="Stretch"></Setter>
            <Setter Property="Margin" Value="10,10,10,5"></Setter>
            <Setter Property="TextWrapping" Value="Wrap" ></Setter>
            <Setter Property="TextAlignment" Value="Left"></Setter>
        </Style>

        <Style TargetType="Grid" x:Key="DuaArabic">
            <Setter Property="Margin" Value="15,20,15,0"></Setter>
            <Setter Property="Background" Value="DarkGray"></Setter>


        </Style>
        <Style TargetType="Grid" x:Key="DuaMalayalam">
            <Setter Property="Margin" Value="15,0,15,0"></Setter>
            <Setter Property="Background" Value="LightGray"></Setter>

        </Style>

    </phone:PhoneApplicationPage.Resources>
   <Grid x:Name="SharePanel" Background="AntiqueWhite">
        <ScrollViewer>
            <StackPanel  Orientation="Vertical">
                <TextBlock Style="{StaticResource DuaText}" Text="{Binding duapretext}" Visibility="{Binding duapretext, 
                        Converter={StaticResource StringToVisibiltyConverter}}"/>
                <Grid Style="{StaticResource DuaArabic}"  Visibility="{Binding arabicDescription, 
                        Converter={StaticResource StringToVisibiltyConverter}}" >
                    <TextBlock Style="{StaticResource DuaTextArabic}" Text="{Binding arabicDescription}"/>
                </Grid>
                <Grid Style="{StaticResource DuaMalayalam}"  Visibility="{Binding transliteration, 
                        Converter={StaticResource StringToVisibiltyConverter}}" >
                    <TextBlock Style="{StaticResource DuaTextMalayalam}" Text="{Binding transliteration}"/>
                </Grid>
                <TextBlock Style="{StaticResource DuaText}"  Text=  "{Binding malayalamDescription}" Visibility="{Binding malayalamDescription, 
                        Converter={StaticResource StringToVisibiltyConverter}}"/>
                <Grid Style="{StaticResource DuaArabic}" Visibility="{Binding arabicDescription2, 
                        Converter={StaticResource StringToVisibiltyConverter}}">
                    <TextBlock Style="{StaticResource DuaTextArabic}"  Text="{Binding arabicDescription2}"/>
                </Grid>
                <Grid Style="{StaticResource DuaMalayalam}"  Visibility="{Binding transliteration2, 
                        Converter={StaticResource StringToVisibiltyConverter}}">
                    <TextBlock Style="{StaticResource DuaTextMalayalam}" Text="{Binding transliteration2}"/>
                </Grid>
                <TextBlock Style="{StaticResource DuaText}"  Text=  "{Binding malayalamDescription2}" Visibility="{Binding malayalamDescription2, 
                        Converter={StaticResource StringToVisibiltyConverter}}"/>
                <Grid Style="{StaticResource DuaArabic}" Visibility="{Binding arabicDescription3, 
                        Converter={StaticResource StringToVisibiltyConverter}}">
                    <TextBlock Style="{StaticResource DuaTextArabic}"  Text="{Binding arabicDescription3}"/>
                </Grid>
                <Grid Style="{StaticResource DuaMalayalam}"  Visibility="{Binding transliteration3, 
                        Converter={StaticResource StringToVisibiltyConverter}}" >
                    <TextBlock Style="{StaticResource DuaTextMalayalam}" Text="{Binding transliteration3}"/>
                </Grid>
                <TextBlock Style="{StaticResource DuaText}"  Text=  "{Binding   malayalamDescription3}" Visibility="{Binding malayalamDescription3, 
                        Converter={StaticResource StringToVisibiltyConverter}}"/>
                <TextBlock Style="{StaticResource DuaText}" Text="{Binding duaposttext}" Visibility="{Binding duaposttext, 
                        Converter={StaticResource StringToVisibiltyConverter}}"/>
           
            </StackPanel>
        </ScrollViewer>
    </Grid>
    <phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True" Mode="Minimized">
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem Text="Share dua as Image..." Click="ApplicationBarMenuItem_Click"/>
                </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>
</phone:PhoneApplicationPage>

ShareImage.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using AdkaarPCL;
using System.Windows.Media.Imaging;
using System.IO;
using Windows.Storage;
using Microsoft.Phone.Tasks;
using System.Windows.Media;

namespace AdkaarWindowsPhone
{
    public partial class ShareImage : PhoneApplicationPage
    {
        public ShareImage()
        {
            InitializeComponent();
        }
        Category dua = new Category();
        protected async override void OnNavigatedTo(System.Windows.Navigation.NavigationEventArgs e)
        {
            base.OnNavigatedTo(e);

            string id = "";
            string index = "";

            if (NavigationContext.QueryString.TryGetValue("id", out id))
            {
                dua = await Helpers.DataHelper.LoadItem(id);
             }
            if (NavigationContext.QueryString.TryGetValue("index", out index))
            {
                SharePanel.DataContext = dua.dua[int.Parse(index)];
            }


        }
        private async void ApplicationBarMenuItem_Click(object sender, EventArgs e)
        {
            var bmp = new WriteableBitmap(SharePanel,null);

            var width = (int)bmp.PixelWidth;
            var height = (int)bmp.PixelHeight;
            using (var ms = new MemoryStream(width * height * 4))
            {

                ms.Seek(0, SeekOrigin.Begin);
                var storagefile = await KnownFolders.SavedPictures.CreateFileAsync("dua.jpg", CreationCollisionOption.GenerateUniqueName);
                using (Stream stream = await storagefile.OpenStreamForWriteAsync())
                {
                    bmp.SaveJpeg(stream, width, height, 0, 100);
                }

                ShareMediaTask Sharer = new ShareMediaTask();
                Sharer.FilePath = storagefile.Path;
                Sharer.Show();

            }

        }
    }
    
}