Browser scrolls to the bottom of the page automatically on load in Localhost

This is the most strange problem I’ve ever seen.
I’m using Visual Studio Enterprise 2015 Version 14.0.25425.01 Update 3 and developing .NET web applications.
Today when I lunched one of web applications, after page loads completely, suddenly it scrolled down to the bottom.
First I thought it may be a javascript function or something, but it wasn’t.
It works without problem on hosted server but in local host this problem exists.

Windows Authentication for Specific windows user group

I created asp.net webpage , i want to log on my asp page using windows username and password when login button click. i have search some code(http://www.codeproject.com/Articles/37558/Windows-Authentication-Using-Form-Authentication) in net for login my asp page. It works for my local user name and password but i want to access Specific domain group members to my asp.net page