C#

<br />
[DllImport("advapi32.dll", SetLastError = true)]<br />
        public static extern bool LogonUser(String lpszUsername, <br />
            String lpszDomain, String lpszPassword,<br />
            int dwLogonType, int dwLogonProvider, ref IntPtr phToken);<br />
        <br />
[DllImport("kernel32.dll", CharSet = CharSet.Auto)]<br />
        public extern static bool CloseHandle(IntPtr handle);<br />
<br />
 private bool LogonUser()<br />
{<br />
    IntPtr tokenHandle = new IntPtr(0);<br />
    const int LOGON32_PROVIDER_DEFAULT = 0;<br />
    const int LOGON32_LOGON_INTERACTIVE = 3;<br />
<br />
    tokenHandle = IntPtr.Zero;<br />
    // Get the domain to authenticate on from the config<br />
    string DomainName = ConfigurationManager.AppSettings["Domain"];<br />
<br />
    try<br />
    {<br />
        // Call LogonUser to obtain a handle to an access token.<br />
        if(LogonUser(txtName.Text, DomainName, txtPwd.Text,<br />
            LOGON32_LOGON_INTERACTIVE, LOGON32_PROVIDER_DEFAULT,<br />
            ref tokenHandle))<br />
        {<br />
            // Since login succeeded, set the current<br />
            // principal to the logged in user<br />
            WindowsIdentity WinIdentity = new WindowsIdentity(tokenHandle);<br />
            System.Threading.Thread.CurrentPrincipal =<br />
                new WindowsPrincipal(WinIdentity);<br />
<br />
            return true;<br />
        }<br />
        else<br />
        {<br />
            return false;<br />
        }<br />
    }<br />
    catch(SystemException)<br />
    {<br />
        MessageBox.Show("Domain could not be found. Check network connection.");<br />
        DialogResult = DialogResult.Abort;<br />
    }<br />
    catch(Exception ex)<br />
    {<br />
        ExceptionPolicy.HandleException(ex, "Unhandled Exception Policy");<br />
        DialogResult = DialogResult.Abort;<br />
    }<br />
    finally<br />
    {<br />
        // Clean up resources<br />
        if( tokenHandle != IntPtr.Zero )<br />
            CloseHandle(tokenHandle);<br />
    }<br />
}<br />

wbjohnson wrote:

this has got to work!