I implemented Custom paging on ASP.NET gridview. Gridview is binding with paging and data. but when i click any page number PageIndexChanging event is not firing. 

Browser debug mode shows - Uncaught ReferenceError: __doPostBack is not defined at <anonymous>:1:1 

        protected void gviewTest_PageIndexChanging(object sender, GridViewPageEventArgs e)
        {
            gviewTest.PageIndex = e.NewPageIndex;
            PagingData(e.NewPageIndex + 1);
        }

<%@ Page Title="" Language="C#" MasterPageFile="~/MasterPage.Master" AutoEventWireup="true" CodeBehind="Index.aspx.cs" %>

<asp:Content ID="Content2" ContentPlaceHolderID="MainContent" runat="server">
    <asp:GridView runat="server" ID="gviewTest" AllowSorting="True" AutoGenerateColumns="False" CssClass="table table-hover" GridLines="None" AllowCustomPaging="True" AllowPaging="True"  OnPageIndexChanging="gviewTest_PageIndexChanging">
    <PagerSettings Mode="Numeric" PageButtonCount="4" />
</asp:GridView>
</asp:Content>