C# program to set attributes of specified file

Program

using System;
using System.IO;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main()
        {
            
            FileAttributes F1 = File.GetAttributes("B123.TXT");
            Console.WriteLine("Attributes before Method Call are :"+F1.ToString());

            File.SetAttributes("B123.TXT", FileAttributes.ReadOnly);

            FileAttributes F2 = File.GetAttributes("B123.TXT");
            Console.WriteLine("Attributes After Method Call are :" + F2.ToString());

        }
    }
}

Output

Attributes before Method Call are :Hidden, Archive
Attributes After Method Call are :ReadOnly

Note: In above program, we need to remember, when we use "File" class, System.IO namespace must be included in the program.