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try
{
ManagementObjectSearcher mys = new ManagementObjectSearcher("Select * from Win32_NerworkAdapterConfiguration");
foreach (ManagementObject x in mys.Get())
{
if (Convert.ToBoolean(x["ipEnabled"]) == true)
{ textBox5.Text = Convert.ToString(x["MACAddress"]); }
}
}
catch (Exception ex) { MessageBox.Show(ex.ToString()); }