Get MAC Address of a machine in Local network (LAN network) in ASP.Net

Please refer below code

HTML

<div>
    <asp:Label ID="lblMacId" runat="server" />
</div>

C#

protected void Page_Load(object sender, EventArgs e)
{
    ManagementObjectSearcher searcher = new ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true");
    IEnumerable<ManagementObject> objects = searcher.Get().Cast<ManagementObject>();
    string mac = (from o in objects orderby o["IPConnectionMetric"] select o["MACAddress"].ToString()).FirstOrDefault();
    lblMacId.Text = mac;
}

VB

Protected Sub Page_Load(sender As Object, e As EventArgs)
    Dim searcher As New ManagementObjectSearcher("SELECT * FROM Win32_NetworkAdapterConfiguration where IPEnabled=true")
    Dim objects As IEnumerable(Of ManagementObject) = searcher.[Get]().Cast(Of ManagementObject)()
    Dim mac As String = (From o In objectsOrder By o("IPConnectionMetric")o("MACAddress").ToString()).FirstOrDefault()
    lblMacId.Text = mac
End Sub

I hope this will help you out.