File Directory Stream C# Tutorial

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  4. Declarative Permission demo
using System;
using System.IO;
using System.Security;
using System.Security.Permissions;
using System.Collections.Generic;
using System.Text;
    class Program
    {
        [FileIOPermission(SecurityAction.Demand, AllLocalFiles=FileIOPermissionAccess.Write)]
        static void Main(string[] args)
        {
            FileStream fs = new FileStream("myfile.txt", FileMode.Create);
            fs.WriteByte(65);
            fs.Close();
        }
    }