title: Login view in iphone
body: <p>I am new to iphone. I am working on my first app. I have a login view,which contains username and password textfields. I try to validate the login page with the following code.but it's not working. 
  Every time,alert view is displaying,What can i do now?
  Is there any suggestions for this or modified code?</p>
  
  <pre>
  - (IBAction) login: (id) sender
  {
  NSString *lakshmi;
  NSString *narayana;
  
  NSLog(@"login %@",usernameField.text);
  if ((usernameField.text== lakshmi)&& (passwordField.text==narayana) )
  {
  [self.view addSubview:Link_view];
  NSLog(@"sucess");
  }
  else {
  
  NSLog(@"INVALID");
  UIAlertView *alert = [[UIAlertView alloc] initWithTitle:nil message:@"Please Enter User Name & Password"
  delegate:self cancelButtonTitle:@"OK" otherButtonTitles:nil];
  
  [alert show];
  [alert release];
  }
  </pre>