C# da Rastgele Sayı Atama

c#

        private void button1_Click(object sender, EventArgs e)

        {

            Random r;

            r = new Random();

            int a,b;

          

            for (int i = 1  ; i < 10; i++)

            {

                listBox1.Items.Add( a = r.Next(10, 50));

            }

        }