By adding MaintainScrollPositionOnPostback="true" in Page directive we can maintain Scroll Position.
<%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="_Default" MaintainScrollPositionOnPostback="true"%>
<%@ Page Language="C#" CodeFile="Default.aspx.cs" Inherits="_Default" MaintainScrollPositionOnPostback="true"%>