C# Çekiliş Programı

 Kodlar;


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

namespace WindowsFormsApplication17
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        Random r = new Random();
        bool durum;
        string[] sanslıIsım = new string[20];
        int ad;
   
        private void button1_Click(object sender, EventArgs e)
        {
            durum = true;
            if (textBox1.Text != "")
            {
                for (int i = 0; i < sanslıIsım.Length; i++)
                {
                    if (sanslıIsım[i] == textBox1.Text)
                    {
                        MessageBox.Show("Aynı");
                        durum = false;
                        break;
                    }
                }
                if (durum == true)
                {
                    sanslıIsım[ad] = textBox1.Text;
                    textBox1.Clear();
                    ad++;
                }
            }
        }
        private void button2_Click(object sender, EventArgs e)
        {
            textBox2.Text = sanslıIsım[r.Next(0, ad)];
        }
    }
}