C#

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Reflection;

namespace Test
{
    [AttributeUsage(AttributeTargets.All)]
    public class myattribute : Attribute
    {
        public myattribute() : base() { }
    }
    public partial class Form1 : Form
    {
        [myattribute]
        Button b1;
        public Form1()
        {
            b1 = new Button();
            this.Controls.Add(b1);
            FieldInfo[] fis = this.GetType().GetFields(
               BindingFlags.Instance | BindingFlags.NonPublic | 
               BindingFlags.Public);
            foreach (FieldInfo fi in fis)
            {
                object[] o = fi.GetCustomAttributes(typeof(myattribute), true);
                if (o.Length != 0)
                {
                    Console.WriteLine("Hello from o");
                }
            }
        }
    }
}

c#_keithy wrote:

e.KeyChar == 13

string text = File.ReadAllText(filename)

Exelioindia wrote:

Is it possible to create this without using any third party tools/DLL.