C# Mac adresi bulma

  using System.Managent;//Ekleyin private **** button1_Click (object sender,EventArgs e) { string Seri No=""; ManagementClass Ethernet Kart=new ManagementClass("Win32_NetworkAdapterConfiguration "); ManagementObjectColletion Elemanlar=Ethernet Kart.GetInstances(); foreach(ManagementObject Eleman in Elemanlar) { if (Seri No=String.Empty) { if((boot)Eleman["IPENabled"]==true) { Seri No=Eleman["MacAddress"].ToString; Label.Text=SeriNo; } } } }