Option Strict On 
Imports System
Imports System.Security.Permissions
Imports System.IO.IsolatedStorage
Imports System.IO


' Notify the CLR to only grant IsolatedStorageFilePermission to called methods.  
' This restricts the called methods to working only with storage files that are isolated  
' by user and assembly.
<IsolatedStorageFilePermission(SecurityAction.PermitOnly, UsageAllowed:=IsolatedStorageContainment.AssemblyIsolationByUser)> _
Public NotInheritable Class App

    Shared Sub Main()
        WriteIsolatedStorage()
    End Sub 'Main
    Shared Sub WriteIsolatedStorage()
        ' Attempt to create a storage file that is isolated by user and assembly. 
        ' IsolatedStorageFilePermission granted to the attribute at the top of this file  
        ' allows CLR to load this assembly and execution of this statement. 
        Dim s As New IsolatedStorageFileStream("AssemblyData", FileMode.Create, IsolatedStorageFile.GetUserStoreForAssembly())
        Try 

            ' Write some data out to the isolated file. 
            Dim sw As New StreamWriter(s)
            Try
                sw.Write("This is some test data.")
            Finally
                sw.Dispose()
            End Try 
        Finally
            s.Dispose()
        End Try 

        ' Attempt to open the file that was previously created. 
        Dim t As New IsolatedStorageFileStream("AssemblyData", FileMode.Open, IsolatedStorageFile.GetUserStoreForAssembly())
        Try 
            ' Read the data from the file and display it. 
            Dim sr As New StreamReader(t)
            Try
                Console.WriteLine(sr.ReadLine())
            Finally
                sr.Dispose()
            End Try 
        Finally
            t.Dispose()
        End Try 

    End Sub 
End Class 'App

' This code produces the following output. 
' 
'  Some test data.

using System;
using System.Security.Permissions;
using System.IO.IsolatedStorage;
using System.IO;

// Notify the CLR to only grant IsolatedStorageFilePermission to called methods.  
// This restricts the called methods to working only with storage files that are isolated  
// by user and assembly.
[IsolatedStorageFilePermission(SecurityAction.PermitOnly, UsageAllowed = IsolatedStorageContainment.AssemblyIsolationByUser)]
public sealed class App
{
    static void Main()
    {
        WriteIsolatedStorage();

    }
    private static void WriteIsolatedStorage()
    {
        // Attempt to create a storage file that is isolated by user and assembly. 
        // IsolatedStorageFilePermission granted to the attribute at the top of this file  
        // allows CLR to load this assembly and execution of this statement. 
        using (Stream s = new IsolatedStorageFileStream("AssemblyData", FileMode.Create, IsolatedStorageFile.GetUserStoreForAssembly()))
        {

            // Write some data out to the isolated file. 
            using (StreamWriter sw = new StreamWriter(s))
            {
                sw.Write("This is some test data.");
            }
        }

        // Attempt to open the file that was previously created. 
        using (Stream s = new IsolatedStorageFileStream("AssemblyData", FileMode.Open, IsolatedStorageFile.GetUserStoreForAssembly()))
        {
            // Read the data from the file and display it. 
            using (StreamReader sr = new StreamReader(s))
            {
                Console.WriteLine(sr.ReadLine());
            }
        }
    }
}

// This code produces the following output. 
// 
//  Some test data.

using namespace System;
using namespace System::Security;
using namespace System::Security::Permissions;
using namespace System::IO::IsolatedStorage;
using namespace System::IO;


static void WriteIsolatedStorage()
{
    try
    {
        // Attempt to create a storage file that is isolated by 
        // user and assembly. IsolatedStorageFilePermission 
        // granted to the attribute at the top of this file 
        // allows CLR to load this assembly and execution of this 
        // statement.
        Stream^ fileCreateStream = gcnew
            IsolatedStorageFileStream(
            "AssemblyData",
            FileMode::Create,
            IsolatedStorageFile::GetUserStoreForAssembly());

        StreamWriter^ streamWriter = gcnew StreamWriter(
            fileCreateStream);
        try
        {
            // Write some data out to the isolated file.

            streamWriter->Write("This is some test data.");
            streamWriter->Close();	
        }
        finally
        {
            delete fileCreateStream;
            delete streamWriter;
        } 
    }
    catch (IOException^ ex)
    {
        Console::WriteLine(ex->Message);
    }

    try
    {
        Stream^ fileOpenStream =
            gcnew IsolatedStorageFileStream(
            "AssemblyData",
            FileMode::Open,
            IsolatedStorageFile::GetUserStoreForAssembly());
        // Attempt to open the file that was previously created.

        StreamReader^ streamReader = gcnew StreamReader(
            fileOpenStream);
        try
        { 
            // Read the data from the file and display it.

            Console::WriteLine(streamReader->ReadLine());
            streamReader->Close();
        }
        finally
        {
            delete fileOpenStream;
            delete streamReader;
        }
    }
    catch (FileNotFoundException^ ex)
    {
        Console::WriteLine(ex->Message);
    }
    catch (IOException^ ex)
    {
        Console::WriteLine(ex->Message);
    }
}
// Notify the CLR to only grant IsolatedStorageFilePermission to called methods.  
// This restricts the called methods to working only with storage files that are isolated  
// by user and assembly.
[IsolatedStorageFilePermission(SecurityAction::PermitOnly, UsageAllowed = IsolatedStorageContainment::AssemblyIsolationByUser)]
int main()
{
	WriteIsolatedStorage();
}

// This code produces the following output. 
// 
//  This is some test data.