Pass parameter from user-defined controls to host page : Basics « Custom Controls « ASP.NET Tutorial

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ASP.NET Tutorial » Custom Controls » Basics 
14. 2. 13. Pass parameter from user-defined controls to host page
File: Control.ascx

<%@ Control Language="C#" AutoEventWireup="true" CodeFile="Control.ascx.cs" Inherits="Control" %>
<div>
    Products:
    <asp:LinkButton ID="lnkBooks" runat="server" CommandArgument="MenuHost.aspx?product=Books" OnCommand="lnk_Command" >Books
  </asp:LinkButton><br />
    <asp:LinkButton ID="lnkToys" runat="server" CommandArgument="MenuHost.aspx?product=Toys" OnCommand="lnk_Command">Toys
  </asp:LinkButton><br />
    <asp:LinkButton ID="lnkSports" runat="server" CommandArgument="MenuHost.aspx?product=Sports" OnCommand="lnk_Command">Sports
  </asp:LinkButton><br />
    <asp:LinkButton ID="lnkFurniture" runat="server" CommandArgument="MenuHost.aspx?product=Furniture" OnCommand="lnk_Command">Furniture
  </asp:LinkButton>
</div>

File: Control.ascx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public partial class LinkMenu : System.Web.UI.UserControl
{
    public event LinkClickedEventHandler LinkClicked;

    protected void lnk_Command(object sender, CommandEventArgs e)
    {
        if (LinkClicked != null)
        {
            LinkClickedEventArgs args = new LinkClickedEventArgs((string)e.CommandArgument);
            LinkClicked(this, args);

            if (!args.Cancel)
            {
                Response.Redirect(args.Url);
            }
        }
    }
}

File: MenuHost.aspx


<%@ Page Language="C#" AutoEventWireup="true"
    CodeFile="MenuHost.aspx.cs" Inherits="MenuHost"%>
<%@ Register TagPrefix="Java2s" TagName="LinkMenu" Src="Control.ascx" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" "http://www.w3.org/TR/xhtml11/DTD/xhtml11.dtd">

<html xmlns="http://www.w3.org/1999/xhtml" >
<head id="Head1" runat="server">
    <title>Menu Host</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <table>
            <tr>
                <td style="width: 100px">
                    <Java2s:LinkMenu id="Menu1" runat="server" OnLinkClicked="LinkClicked" />
                </td>
                <td>
                    &nbsp;&nbsp;<asp:Label id="lblSelection" runat="server" EnableViewState="false"/><br />
                    &nbsp;&nbsp;<asp:Label id="lblClick" runat="server" EnableViewState="false"/>
                </td>
            </tr>
        </table>
        <br />
        &nbsp;
    </div>
    </form>
</body>
</html>


File: MenuHost.aspx.cs

using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;

public class LinkClickedEventArgs : EventArgs
{
    private string url;
    public string Url
    {
        get return url; }
        set url = value; }
    }

    private bool cancel = false;
    public bool Cancel
    {
        get return cancel; }
        set cancel = value; }
    }

    public LinkClickedEventArgs(string url)
    {
        Url = url;
    }
}
public delegate void LinkClickedEventHandler(object sender,  LinkClickedEventArgs e);



public partial class MenuHost : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!Page.IsPostBack)
        {
            if (Request.Params["product"!= null)
            {
                lblSelection.Text = "You chose: ";
                lblSelection.Text += Request.Params["product"];
            }
        }
    }

    protected void LinkClicked(object sender, LinkClickedEventArgs e)
    {
        if (e.Url == "MenuHost.aspx?product=Furniture")
        {
            lblClick.Text = "This link is not allowed.";
            e.Cancel = true;
        }
    }

}
14. 2. Basics
14. 2. 1. User control with property
14. 2. 2. ASP controls in user control
14. 2. 3. A Web user control file template
14. 2. 4. Adding controls to the Web user control
14. 2. 5. Creating control events in a user control (C#)
14. 2. 6. Creating control events in a user control (VB)
14. 2. 7. Exposing user control properties (C#)
14. 2. 8. Exposing user control properties (VB)
14. 2. 9. Populating user control properties from the host Web page (C#)
14. 2. 10. Populating user control properties from the host Web page (VB)
14. 2. 11. Component level variable
14. 2. 12. Action from user-defined control
14. 2. 13. Pass parameter from user-defined controls to host page
14. 2. 14. Calculator component based on page component (VB.net)
14. 2. 15. Day minder page component
14. 2. 16. Use custom control in Assembly
14. 2. 17. Building a simple User control that randomly displays one image
14. 2. 18. Registering User Controls in the Web Configuration File
14. 2. 19. Building Fully Rendered Controls
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