ASP.NET: prevent page is scrolling up when dropdownlist selected index change

if you are testing this functionality only in IE it should work without any problem. but for Chrome you need to go through the following steps :
1.Right click on the project.
2.Click on “Add” -> “Add New Item”.
3.In the “Add New Item” window, select “Browser File” and click “Add”.

4.Application will ask you to place this file in “App_Browsers” folder, click “Yes”
5.Now add the capability of maintaining the scroll position as follows:

 <browsers>
  <browser refid="Safari1Plus">
    <capabilities>
      <capability name="supportsMaintainScrollPositionOnPostback">
          value="true" />
    </capability></capabilities>
  </browser>
</browsers>

For more information refer to the following links
Maintain Scroll Position Problem fix for Chrome.[^]

http://msdn.microsoft.com/en-us/library/system.web.ui.page.maintainscrollpositiononpostback.aspx


and also here they mentioned that this functionality didn't used to work in Firefox, it's fixed in Dec 29th 2011 ASP.NET hotfix.
http://connect.microsoft.com/VisualStudio/feedback/details/714316/asp-net-4-0-30319-maintainscrollpositiononpostback-now-fails-in-firefox[^]


if you want to have your own custom solution you can refer to the following link :

http://www.aspsnippets.com/Articles/ASPNet-MaintainScrollPositionOnPostback-not-working-in-Firefox-and-Chrome.aspx[^]