C#

Dotnetkanna wrote:

plz help me..its urgent...

Christian Graus wrote:

But, why would you require someone to log on using creditials they have already logged on with ?

const int LOGON32_LOGON_INTERACTIVE = 2;
const int LOGON32_PROVIDER_DEFAULT = 0;

[DllImport("advapi32.dll", SetLastError=true)]
private static extern bool LogonUser(String lpszUsername, String lpszDomain, String lpszPassword, int dwLogonType, int dwLogonProvider, ref IntPtr phToken);

private void DoLogonCheck()
{
  this.logonAttemptCount++;
  IntPtr phToken = IntPtr.Zero;

  bool logonRes = LogonUser(
    txtDomainUserName.Text,
    txtDomainName.Text,
    txtDomainPassword.Text, 
    LOGON32_LOGON_INTERACTIVE,
    LOGON32_PROVIDER_DEFAULT,
    ref phToken);

  if (logonRes)
  {
    this.DialogResult = DialogResult.OK;
    this.domainUserName = txtDomainUserName.Text;
    this.domainName = txtDomainName.Text;
  }
  else if ((!logonRes) && (this.logonAttemptCount < this.maxLogonAttempts))
  {
    //show message box with logon fail message

    txtDomainPassword.Text = string.Empty;
    txtDomainPassword.Focus();
  }
  else if ((!logonRes) && (this.logonAttemptCount >= this.maxLogonAttempts))
  {
    //show message box advising to many failures, app will quit

    System.Windows.Forms.Application.Exit();
  }
}

using....
using....
using....

namespace Widgets
{
  class LogonCheck
  {
    //declaration for dll import (as above)
    private string domainUserName;
    private string domainName;
    private int logonAttemptCount;

    public LogonCheck()
    {
      this.domainUserName = string.Empty;
      this.domainName = string.Empty;
      this.logonAttemptCount = 0;
    }

    public DoLogonCheck()
    {
       //interop calls (as above)
    }
  }
}