Save and Load data using Isolated Storage in Silverlight

This article demonstrates the use of Isolated Storage in Silverlight. In this article I will explain how to save and load data using Isolated Storage.

What is Isolated Storage? 
Isolated Storage is like cookies which provide the ability to store data on client between application invocations but unlike cookies Isolated Storage is full-fledged virtual file system, it provides the application ability to Create, Read, Write, Delete and enumerate files and directories inside the virtual file system.

First of all make a new Silverlight project and add assembly reference "System.XML.Linq" using Add Reference.

Now add two button on page first button for save content in IsolatedStorage  and second for load data from IsolatedStorage.

MainPage.xaml 

  <Grid x:Name="LayoutRoot" Background="White" Margin="0,0,8,0">

        <TextBlock x:Name ="TechnologiesTextBlock" Canvas.Top ="10" TextWrapping="Wrap" Margin="10,37,10,8"/>

        <Button Content="Save in Isolated Storage" Height="23" HorizontalAlignment="Left" Margin="8,10,0,0" x:Name="btnSave" VerticalAlignment="Top" Width="169" Click="btnSave_Click" />

        <Button Content="Load from Isolated Storage" Height="23" HorizontalAlignment="Right" Margin="0,10,25,0" x:Name="btnLoad" VerticalAlignment="Top" Width="180" RenderTransformOrigin="2.013,-0.478" Click="btnLoad_Click" />

    </Grid>

MainPage.xaml.cs

Add these three namespace

using System.IO;

using System.IO.IsolatedStorage;
using System.Xml.Linq; 

// Save button click event

private void btnSave_Click(object sender, System.Windows.RoutedEventArgs e)

        {

          // TODO: Add event handler implementation here.

                             XDocument xDocument = new XDocument(

                    new XComment("Technologies"),

                    new XElement("Web",

                        new XElement("ASPDOTNET", "ASPDOTNET"),

                        new XElement("Silverlight", "Silverlight"),

                        new XElement("WebDesign", "WebDesign"),

                        new XElement("WebServices", "WebServices")

                    )

                );

         

            using (IsolatedStorageFile isolatedStorageFile = IsolatedStorageFile.GetUserStoreForApplication())

            {

                using (IsolatedStorageFileStream isolatesFileStream =

                    new IsolatedStorageFileStream("CSharpCornerTechnologies.xml", FileMode.Create, isolatedStorageFile))

                {

                    xDocument.Save(isolatesFileStream);

                    MessageBox.Show("Data saved successlly");

                }

            }

        }

 

// Load button click event.

  private void btnLoad_Click(object sender, System.Windows.RoutedEventArgs e)

        {

          // TODO: Add event handler implementation here.

            using (IsolatedStorageFile isolatedStorageFile = IsolatedStorageFile.GetUserStoreForApplication())

            {

                using (IsolatedStorageFileStream isolatesFileStream = new IsolatedStorageFileStream("CSharpCornerTechnologies.xml", FileMode.Open, isolatedStorageFile))

                {

                    XDocument xDocument = XDocument.Load(isolatesFileStream);

                    TechnologiesTextBlock.Text = xDocument.ToString();

                }

            }

        }

 

Now time to run the application.

  

Image 1.

 

Click on Save button:

Image 2.

Now click on Load button:

 

Image 3.

 

That's all. Questions or comments are most welcome in c-sharpcorner comments section. For more information I have attached my sample application.