Whenever cookies are disabled in my browser and then i try to login on login page it unable to create session and so unable to login in system. Then i change the cookie setting to
<sessionState cookieless="true" timeout="20" />
in my web.config and then try to login Post action of the login function it doesnt call and whenever i input username and password and sumbit it, it call simple login action instead of Post one. What is the issue?
You shouldn't confuse session with authentication. If you are using Forms Authentication a separate cookie will be used to track authenticated users. Here's a good article explaining how to enable cookieless forms authentication. You could set the cookieless attribute on the <forms> element.
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"im not using form authentication instead i have built my own login mechanism. I just want to login user whenever cookies are disabled in user browser"
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That's the problem with rolling your own login: you lose all the benefits of using Membership Providers. You should cast your "own login mechanism" into a custom membership provider so that you can benefit from what ASP.NET provides out of the box.
Writing a custom membership provider is not difficult, and there are loads of articles, samples and blogs on the subject.
4guysfromrolla.com, for example, has a series of articles dedicated to the ASP.NET membership provider.