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How do I use impersonation in a ASP.NET C# Web Site to simply show the current users login details in a textbox?

Shepwedd asked
Last Modified: 2013-12-17
I have written the attached code to write the current users login details to a text box control in my asp.net web site but all I seem to get written to the text box as a result is: "System.Security.Principal.WindowsImpersonationContext". It's as if the compiler isn't picking up the class? When I debug I can see that the User.Identity is pulling back the correct details but upon running my text box doesn't reflect these details?

using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Security.Principal;
using System.Runtime.InteropServices;
public partial class _Default : System.Web.UI.Page 
    protected void Page_Load(object sender, EventArgs e)
        System.Security.Principal.WindowsImpersonationContext impersonationContext;
        impersonationContext =
        TextBox1.Text = impersonationContext.ToString();

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