we uniquely identify a client in ASP.net

Dear Friend,

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string[] computer_name = System.Net.Dns.GetHostEntry(Request.ServerVariables["remote_addr"]).HostName.Split(new Char[] { '.' });
            String ecn = System.Environment.MachineName;
            txtECN.Text = computer_name[0].ToString();

This link will do the thing for you:-

http://forums.asp.net/t/821809.aspx/1[^]