Asp.net obtains the Domain Name of the host on the current network by specifying an IP address

<% @ Import namespace = "system. Net" %>
<Script language = "C #" runat = Server>
Protected void doclick (Object SRC, eventargs e ){
Iphostentry hostinfo = DNS. gethostbyaddr (txtip. Text );
Showmsg. Text = hostinfo. hostname;
}
</SCRIPT>
<Asp: Label runat = server id = showmsg/>
<Form ID = testform runat = Server>
IP address: <asp: textbox runat = server id = txtip/> <asp: button runat = server id = Do text = "" onclick = doclick/>
</Form>