ASP .net Login Control usage

Hi,
I am using ASP.Net Login control in my application. My problem is I am not able to use the 'Remember Me Next time' check box. What I mean is even though I have selected the check box to remember the pass word, It is not being implemented.
For the first time when I run the application, I gave my user id and password and checked the 'Remember Me' Check box. But the second time I run the application then also it is asking for the userid and password.

In the web.config file I have given Authentication Mode as Forms.

Please me regarding the usage of this control. Thanks in advance.