C #. net how to obtain the local ip Address

Using System;
Using System. Collections;
Using System. ComponentModel;
Using System. Data;
Using System. Drawing;
Using System. Web;
Using System. Web. SessionState;
Using System. Web. UI;
Using System. Web. UI. WebControls;
Using System. Web. UI. HtmlControls;
Using System. Net;

Namespace WebApplication5
{
/// <Summary>
/// Summary of WebForm1.
/// </Summary>
Public class WebForm1: System. Web. UI. Page
{
Protected System. Web. UI. WebControls. TextBox TextBox1;
 
Private void Page_Load (object sender, System. EventArgs e)
{
// Place user code here to initialize the page
String strHostIP = "";
IPHostEntry oIPHost = Dns. Resolve (Environment. MachineName );
If (oIPHost. AddressList. Length> 0)
StrHostIP = oIPHost. AddressList [0]. ToString ();
This. TextBox1.Text = strHostIP;

}

# Code generated by region Web Form Designer
Override protected void OnInit (EventArgs e)
{
//
// CODEGEN: This call is required by the ASP. NET Web form designer.
//
InitializeComponent ();
Base. OnInit (e );
}

/// <Summary>
/// The designer supports the required methods-do not use the code editor to modify
/// Content of this method.
/// </Summary>
Private void InitializeComponent ()
{
This. Load + = new System. EventHandler (this. Page_Load );

}
# Endregion
}
}