Sunday, 1 January 2012

ListBox example in ASP.NET

Asp.net 2.0 and Above
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="listbox.aspx.cs" Inherits="_Default" %>

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

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title>Untitled Page</title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    <h2 style=" color:blue; font-style:normal ">  
            How to use ListBox  and
            <br /> ClearSelection method in asp.net  
        </h2>  
        <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple" Font-Size="Medium" Font-Italic="true">
        <asp:ListItem Value="HI">HI</asp:ListItem>
        <asp:ListItem Value="HOW">HOW</asp:ListItem>
        <asp:ListItem Value="ARE">ARE</asp:ListItem>
        <asp:ListItem Value="YOU">YOU</asp:ListItem>    
        </asp:ListBox><br />
        <asp:Label ID="Label1" runat="server" Text="" Font-Size="Medium" ForeColor=" blue" ></asp:Label>
        <asp:RequiredFieldValidator ID="RequiredFieldValidator1" runat="server" ErrorMessage="Select atleast one" ControlToValidate="ListBox1"></asp:RequiredFieldValidator><br /><br />
        <asp:Button ID="Button1" runat="server" Text="SUBMIT" onclick="Button1_Click" Height="30"  
            Font-Bold="true"  
            ForeColor="blue" />
        <asp:Button
            ID="Button2" runat="server" Text="Clear" onclick="Button2_Click" Height="30"  
            Font-Bold="true"  
            ForeColor="blue"/>
    </div>
    </form>
</body>
</html>
Code Behind in C# 
using System;
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 _Default : System.Web.UI.Page
{
    protected void Page_Load(object sender, EventArgs e)
    {

    }
    protected void Button1_Click(object sender, EventArgs e)
    {
        var sSkill = "";
        ListBox project = FindControl("ListBox1") as ListBox;
        foreach (ListItem oItem in project.Items)
        {
            if (oItem.Selected)
            {
                if (sSkill.Length == 0)
                    sSkill = oItem.Value;
                else
                    sSkill = sSkill + " " + oItem.Value;

            }
        }
        Label1.Text = sSkill;
    }
    protected void Button2_Click(object sender, EventArgs e)
    {
        ListBox1.ClearSelection();
        Label1.Text = "";
        RequiredFieldValidator1.Enabled = false;
    }
}


Screen shots


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