Authentication Reporting Services And Web Reportviewer

Hi,
I€™ve an application Web which uses to reportviewer to show information. I want that all the users of the application accede to reports by means of he himself user and password. This user is a local user of report€™s server. The problem is that when attempt to show report always appear the following error:
The request failed with HTTP status 401: Unauthorized.
The code that use is the following one:



ReportViewer1.ServerReport.ReportServerCredentials = new ReportViewerCredentials("Usuario", "pwd", "servidor");


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 Microsoft.Reporting.WebForms;
using System.Net;
using System.Security.Principal;
using System.Runtime.InteropServices;

/// <summary>
/// Summary description for ReportViewerCredentials
/// </summary>
public class ReportViewerCredentials : IReportServerCredentials
{
[DllImport("advapi32.dll", SetLastError = true)]
public extern static bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

[DllImport("kernel32.dll", CharSet = CharSet.Auto)]
public extern static bool CloseHandle(IntPtr handle);

[DllImport("advapi32.dll", CharSet = CharSet.Auto, SetLastError = true)]
public extern static bool DuplicateToken(IntPtr ExistingTokenHandle,
int SECURITY_IMPERSONATION_LEVEL, ref IntPtr DuplicateTokenHandle);

public ReportViewerCredentials()
{
}

public ReportViewerCredentials(string username)
{
this.Username = username;
}


public ReportViewerCredentials(string username, string password)
{
this.Username = username;
this.Password = password;
}


public ReportViewerCredentials(string username, string password, string domain)
{
this.Username = username;
this.Password = password;
this.Domain = domain;
}


public string Username
{
get
{
return this.username;
}
set
{
string username = value;
if (username.Contains("\"))
{
this.domain = username.Substring(0, username.IndexOf("\"));
this.username = username.Substring(username.IndexOf("\") + 1);
}
else
{
this.username = username;
}
}
}
private string username;



public string Password
{
get
{
return this.password;
}
set
{
this.password = value;
}
}
private string password;


public string Domain
{
get
{
return this.domain;
}
set
{
this.domain = value;
}
}
private string domain;




#region IReportServerCredentials Members

public bool GetBasicCredentials(out string basicUser, out string basicPassword, out string basicDomain)
{
basicUser = username;
basicPassword = password;
basicDomain = domain;
return username != null && password != null && domain != null;
}

public bool GetFormsCredentials(out string formsUser, out string formsPassword, out string formsAuthority)
{
formsUser = username;
formsPassword = password;
formsAuthority = domain;
return username != null && password != null && domain != null;

}

public bool GetFormsCredentials(out Cookie authCookie,out string user, out string password, out string authority)
{
authCookie = null;
user = password = authority = null;
return false; // Not implemented
}


public WindowsIdentity ImpersonationUser
{
get
{

string[] args = new string[3] { this.Domain.ToString(), this.Username.ToString(), this.Password.ToString() };
IntPtr tokenHandle = new IntPtr(0);
IntPtr dupeTokenHandle = new IntPtr(0);

//const int LOGON32_PROVIDER_DEFAULT = 0;
////This parameter causes LogonUser to create a primary token.
//const int LOGON32_LOGON_INTERACTIVE = 2;

const int LOGON32_PROVIDER_DEFAULT = 3;
//This parameter causes LogonUser to create a primary token.
const int LOGON32_LOGON_INTERACTIVE = 9;
const int SecurityImpersonation = 2;


tokenHandle = IntPtr.Zero;
dupeTokenHandle = IntPtr.Zero;
try
{
// Call LogonUser to obtain an handle to an access token.
bool returnValue = LogonUser(args[1], args[0], args[2],
LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,
ref tokenHandle);

if (false == returnValue)
{
Console.WriteLine("LogonUser failed with error code : {0}",Marshal.GetLastWin32Error());
return null;
}

// Check the identity.
System.Diagnostics.Trace.WriteLine("Before impersonation: "
+ WindowsIdentity.GetCurrent().Name);



bool retVal = DuplicateToken(tokenHandle, SecurityImpersonation, ref dupeTokenHandle);
if (false == retVal)
{
CloseHandle(tokenHandle);
Console.WriteLine("Exception in token duplication.");
return null;
}


// The token that is passed to the following constructor must
// be a primary token to impersonate.
WindowsIdentity newId = new WindowsIdentity(dupeTokenHandle);
WindowsImpersonationContext impersonatedUser = newId.Impersonate();


// Free the tokens.
if (tokenHandle != IntPtr.Zero)
CloseHandle(tokenHandle);
if (dupeTokenHandle != IntPtr.Zero)
CloseHandle(dupeTokenHandle);

// Check the identity.
System.Diagnostics.Trace.WriteLine("After impersonation: "
+ WindowsIdentity.GetCurrent().Name);

return newId;

}
catch (Exception ex)
{
Console.WriteLine("Exception occurred. " + ex.Message);
}

return null;
}
}


public ICredentials NetworkCredentials
{
get
{
return null; // Not using NetworkCredentials to authenticate.
}
}


#endregion


}