Define and use namespace in code behind

<%@ Page language="c#" src="CookieExample.aspx.cs" AutoEventWireup="false" Inherits="YourNamespace.CookieExample" %>
<HTML>
  <body>
    <form id="Form1" method="post" runat="server">
      <asp:Label id="lblWelcome" style="Z-INDEX: 100; LEFT: 16px; POSITION: absolute; TOP: 24px"
        runat="server" Width="412px" Height="130px" BackColor="LightYellow" Font-Size="Medium"
        Font-Names="Verdana" BorderWidth="2px" BorderStyle="Groove"></asp:Label>
      <asp:Button id="Button1" style="Z-INDEX: 105; LEFT: 288px; POSITION: absolute; TOP: 264px" runat="server"
        Width="137px" Text="Submit Page"></asp:Button>
      <asp:TextBox id="txtName" style="Z-INDEX: 101; LEFT: 96px; POSITION: absolute; TOP: 200px" runat="server"
        Width="184px" Height="24px"></asp:TextBox>
      <asp:Button id="cmdStore" style="Z-INDEX: 103; LEFT: 288px; POSITION: absolute; TOP: 200px"
        runat="server" Width="137px" Text="Create Cookie"></asp:Button>
      <asp:Label id="Label1" style="Z-INDEX: 104; LEFT: 24px; POSITION: absolute; TOP: 204px" runat="server"
        Width="56px" Height="16px" Font-Size="X-Small" Font-Names="Verdana">Name:</asp:Label>
    </form>
  </body>
</HTML>

<%--
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Net;

namespace YourNamespace
{
  /// <summary>
  /// Summary description for CookieExample.
  /// </summary>
  public class CookieExample : System.Web.UI.Page
  {
    protected System.Web.UI.WebControls.Label lblWelcome;
    protected System.Web.UI.WebControls.TextBox txtName;
    protected System.Web.UI.WebControls.Button cmdStore;
    protected System.Web.UI.WebControls.Button Button1;
    protected System.Web.UI.WebControls.Label Label1;
  
    private void Page_Load(object sender, System.EventArgs e)
    {
      HttpCookie cookie = Request.Cookies["Preferences"];
      if (cookie == null)
      {
        lblWelcome.Text = "<b>Unknown Customer</b>";
      }
      else
      {
        lblWelcome.Text = "<b>Cookie Found.</b><br><br>";
        lblWelcome.Text += "Welcome, " + cookie["Name"];
      }

    }

    #region Web Form Designer generated code
    override protected void OnInit(EventArgs e)
    {
      //
      // CODEGEN: This call is required by the ASP.NET Web Form Designer.
      //
      InitializeComponent();
      base.OnInit(e);
    }
    
    /// <summary>
    /// Required method for Designer support - do not modify
    /// the contents of this method with the code editor.
    /// </summary>
    private void InitializeComponent()
    {    
      this.cmdStore.Click += new System.EventHandler(this.cmdStore_Click);
      this.Load += new System.EventHandler(this.Page_Load);

    }
    #endregion

    private void cmdStore_Click(object sender, System.EventArgs e)
    {
      HttpCookie cookie = Request.Cookies["Preferences"];
      if (cookie == null)
      {
        cookie = new HttpCookie("Preferences");
      }

      cookie["Name"] = txtName.Text;
      cookie.Expires = DateTime.Now.AddYears(1);
      Response.Cookies.Add(cookie);

      lblWelcome.Text = "<b>Cookie Created.</b>";
      lblWelcome.Text += "New Customer: " + cookie["Name"];

    }
  }
}

--%>
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Define and use namespace in code behind : Code Behind « Development « ASP.Net

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