How to stop page scoll on pastback

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C#

i have a gridview in update panel. as well my ASP.net page is inheriting from Master Page. When i am click On
Selected index changed event of gridview. then the page scroll is not maintaining at its position. the scroll 
is  Reloading. I tried Page MaintainScrollPositionOnPostback="true" but it still not working. As Well try with 
Other Javascript code but still facing some issued 

What I have tried:

i have Also tried from backend with MyGrid.SelectedRow.Focus(); but here it is Selecting FIrst row of my gridview.