private void Form1_Load(object sender, EventArgs e) 
          { 
              Random rastgele = new Random(); 
              int[] dizi = new int[6]; 
   
              for (int i = 0; i < 6; i++) 
              { 
                  int sayi = rastgele.Next(1, 50); 
   
                  while (dizi.Contains(sayi)) 
                  { 
                      sayi = rastgele.Next(1, 50); 
                  } 
   
                  dizi[i] = sayi; 
                  label1.Text += dizi[i].ToString() + Environment.NewLine; 
              } 
          }