Get page number from datapager control in asp.net

<asp:DataPager ID="listPager" runat="server"   PagedControlID="lviewEarnSearch" PageSize="10"   OnPreRender="listPager_PreRender" QueryStringField="pageid">
  <Fields>
    <asp:NumericPagerField />
    <asp:NextPreviousPagerField LastPageText=">>>" ShowNextPageButton="false" ShowLastPageButton="True" ShowPreviousPageButton="False" />
  </Fields>
</asp:DataPager>

"QueryStringField" is used for Get Page Number of paging. 

Get session variable in javascript

<script type="text/javascript"  >
var UserID = "<%= UserID%>";
</Script>
 

Using ConvertAll in Generic List

var result = Context.User.Where(p => p.ID == UserID && p.Withdrawal == null).Select(c=>c.Deposit).ToList().ConvertAll<decimal>(x=>Convert.ToDecimal(x)).Sum(c => c);