I think this article might help you.
Let me know if you face any problem while understanding the code.
Edit 1 : I am confused with your question.
my idea: According above Windows shoud
be provide some vay to validate and
enter username and password
Do you want to validate a entered username and password?
Ahh, sorry for the delay. Here's the converted c# code
Add following namespaces:
using System.Security.Principal;
using System.Security.Permissions;
using System.Runtime.InteropServices;
And then here goes the main code :
namespace WindowsAccount
{
public partial class Form1 : Form
{
[DllImport("advapi32.dll", SetLastError = true)]
public static extern bool LogonUser(string lpszUsername,
string lpszDomain,
string lpszPassword,
int dwLogonType,
int dwLogonProvider,
out IntPtr phToken
);
[DllImport("kernel32.dll")]
public static extern int FormatMessage(int dwFlags, ref IntPtr lpSource, int dwMessageId, int dwLanguageId, ref String lpBuffer, int nSize, ref IntPtr Arguments);
[DllImport("kernel32.dll", SetLastError = true)]
[return: MarshalAs(UnmanagedType.Bool)]
static extern bool CloseHandle(IntPtr hObject);
public static string GetErrorMessage(int errorCode)
{
int FORMAT_MESSAGE_ALLOCATE_BUFFER = 0x100;
int FORMAT_MESSAGE_IGNORE_INSERTS = 0x200;
int FORMAT_MESSAGE_FROM_SYSTEM = 0x1000;
int msgSize = 255;
string lpMsgBuf = null;
int dwFlags = FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS;
IntPtr lpSource = IntPtr.Zero;
IntPtr lpArguments = IntPtr.Zero;
int returnVal = FormatMessage(dwFlags, ref lpSource, errorCode, 0, ref lpMsgBuf, msgSize, ref lpArguments);
if (returnVal == 0)
{
throw new Exception("Failed to format message for error code " + errorCode.ToString() + ". ");
}
return lpMsgBuf;
}
public Form1()
{
InitializeComponent();
}
private void btnLogin_Click(object sender, EventArgs e)
{
IntPtr tokenHandle = new IntPtr(0);
try
{
string UserName = null;
string MachineName = null;
string Pwd = null;
//The MachineName property gets the name of your computer.
MachineName = System.Environment.MachineName;
UserName = txtUser.Text;
Pwd = txtPass.Text;
const int LOGON32_PROVIDER_DEFAULT = 0;
const int LOGON32_LOGON_INTERACTIVE = 2;
tokenHandle = IntPtr.Zero;
//Call the LogonUser function to obtain a handle to an access token.
bool returnValue = LogonUser(UserName, MachineName, Pwd, LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT, out tokenHandle);
if (returnValue == false)
{
//This function returns the error code that the last unmanaged function returned.
int ret = Marshal.GetLastWin32Error();
string errmsg = GetErrorMessage(ret);
MessageBox.Show(errmsg);
}
else
{
//Create the WindowsIdentity object for the Windows user account that is
//represented by the tokenHandle token.
WindowsIdentity newId = new WindowsIdentity(tokenHandle);
WindowsPrincipal userperm = new WindowsPrincipal(newId);
//Verify whether the Windows user has administrative credentials.
if (userperm.IsInRole(WindowsBuiltInRole.Administrator))
{
MessageBox.Show("Access Granted. User is admin");
}
else
{
MessageBox.Show("Access Granted. User is not admin");
}
}
CloseHandle(tokenHandle);
}
catch (Exception ex)
{
MessageBox.Show("Exception occurred. " + ex.Message);
}
}
}
}
Let me know if you face any problem.