Register library in asp.net or import library in asp.net or using library in asp.net:-
<%@ Register Assembly="AjaxControlToolkit" Namespace="AjaxControlToolkit" TagPrefix="asp" %>
<%@ Import Namespace="System" %>
<%@ Import Namespace="System.Data" %>
<%
Dim dt As New DataTable
If (IsNothing(Session("bill_data")) = False) Then
dt = Session("bill_data")
End If
Dim pg = Request.QueryString("pg")
%>
