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ÐÐ 31: {
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using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
public partial class _Default : System.Web.UI.Page
{
    protected System.Web.UI.WebControls.Label lbExist;
        protected System.Web.UI.WebControls.Label Label2;
        public const int LOGON32_LOGON_INTERACTIVE = 2;
        public const int LOGON32_PROVIDER_DEFAULT = 0;
        WindowsImpersonationContext impersonationContext; 
        [DllImport("advapi32.dll", CharSet=CharSet.Auto)]
        public static extern int LogonUser(String lpszUserName,String lpszDomain,
        String lpszPassword,int dwLogonType,int dwLogonProvider,
        ref IntPtr phToken);
        [DllImport("advapi32.dll", CharSet=System.Runtime.InteropServices.CharSet.Auto, 
        SetLastError=true)]
        public extern static int DuplicateToken(IntPtr hToken,int impersonationLe


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