how to get the client ip address who login his system in asp.net with c#

 protected void Page_Load(object sender, EventArgs e)
    {
        
        string strHostName = System.Net.Dns.GetHostName();
        string clientIPAddress = System.Net.Dns.GetHostAddresses(strHostName).GetValue(0).ToString();

        string strcon = "Data Source=";
        strcon += clientIPAddress+";" + "Initial Catalog=POS;Trusted_connection=true";

        
        SqlConnection con = new SqlConnection(strcon);
        SqlCommand cmd = new SqlCommand("select * from AllTransactions where BranchKey=" + Convert.ToInt32(Session["BranchKey"]) + "", con);

        SqlDataAdapter da = new SqlDataAdapter(cmd);
        DataSet ds = new DataSet();
        da.Fill(ds, "tt");
        GridView1.DataSource = ds.Tables["tt"];
        GridView1.DataBind();
    }