ASP.NET import directive is used at page level (.aspx file) and is used by the ASP.NET page parser and compiler.
Syntax
<%@ Import attribute="value" [attribute="value"...] %>
<%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Data" %> <%@ Import Namespace="System.Text.RegularExpressions" %> <%@ Import Namespace="System.Web.UI" %> <%@ Import Namespace="System.Web.UI.WebControls" %> <%@ Import Namespace="System.Xml" %> <%@ Import Namespace="ystem.Xml.Linq" %>