{filelink=17848}

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

public class MainClass
{
    public static void Main()
	{
        PermissionSet permission = new PermissionSet(System.Security.Permissions.PermissionState.None);

        permission.AddPermission(new FileIOPermission(FileIOPermissionAccess.Read | FileIOPermissionAccess.Write | FileIOPermissionAccess.Append, @"c:mesexemplesteste.txt"));

       permission.Assert();

        FileStream fs = new FileStream(@"c:mesexemplesteste.txt",FileMode.OpenOrCreate, FileAccess.Write);
        StreamWriter m_streamWriter = new StreamWriter(fs);

        m_streamWriter.BaseStream.Seek(0, SeekOrigin.End);
        m_streamWriter.Write("Bienvenu sur csharp.mesexemples.com");
    }
}