Sunday, 1 January 2012

How to use ListBox in ASP.NET

Asp.net List Box 
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="listbox2.aspx.cs" Inherits="listbox2" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html>
<head runat="server">
    <title>Untitled Page</title>
</head>

<body>

    <form id="Form1" runat="server">
     <h2 style=" color:blue; font-style:normal ">Moving items between lists 
     <br />with Add and Remove</h2> 

    <table width="300" border="0" cellspacing="1" cellpadding="1">
        <tr>
            <td >Skill:</td>
            <td ></td>
            <td >Skill set:</td>
        </tr>
        <tr>
            <td >        
                <asp:ListBox id="UserList" runat="server" Rows="4" selectionmode="Multiple">
                    <asp:ListItem>ASP</asp:ListItem>
                    <asp:ListItem>C#</asp:ListItem>
                    <asp:ListItem>VB</asp:ListItem>
                    <asp:ListItem>ADO</asp:ListItem>
                </asp:ListBox>
            </td>
            <td>
            <asp:button text="->" runat="server" ID="AddButton" onclick="AddButton_Click"/>
            <br/>
            <asp:button text="<-" runat="server" ID="RemoveButton" onclick="RemoveButton_Click"/>
            </td>
            <td >        
                <asp:ListBox id="GroupList" runat="server" Rows="4" selectionmode="Multiple">
                </asp:ListBox>
            </td>
        </tr>
    </table>

    </form>

</body>
</html>
Code Behind in C# 
using System;
using System.Collections;
using System.Configuration;
using System.Data;
using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;

public partial class listbox2 : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void AddButton_Click(Object sender, EventArgs e)
    {
        ListItemCollection Users = new ListItemCollection();
        foreach (ListItem User in UserList.Items)
        {
            if (User.Selected)
                Users.Add(User);
        }
        foreach (ListItem User in Users)
        {
            UserList.Items.Remove(User);
            GroupList.Items.Add(User);
        }
    }
    protected void RemoveButton_Click(Object sender, EventArgs e)
    {
        ListItemCollection Users = new ListItemCollection();
        foreach (ListItem User in GroupList.Items)
        {
            if (User.Selected)
                Users.Add(User);
        }
        foreach (ListItem User in Users)
        {
            UserList.Items.Add(User);
            GroupList.Items.Remove(User);
        }
    }
}


Screen shots

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