List of employees is available in a listbox. Write an ASP.Net application to add selected or all records from the listbox to a TextBox (assume multi-line property of TextBox is true)

Answer:

Default.aspx

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="WebApplication5.WebForm1" %>

<!DOCTYPE html>

<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
        <div>
            <h2>ListBox to TextBox Example</h2>
            <asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple">
                <asp:ListItem>John Doe</asp:ListItem>
                <asp:ListItem>Jane Smith</asp:ListItem>
                <asp:ListItem>Peter Parker</asp:ListItem>
                <asp:ListItem>Clark Kent</asp:ListItem>
            </asp:ListBox>
            <br /><br />
            <asp:Button ID="Button1" runat="server" Text="Add Selected to TextBox" OnClick="btnAddSelected_Click" />
            <asp:Button ID="Button2" runat="server" Text="Add All to TextBox" OnClick="btnAddAll_Click" />
            <br /><br />
            <asp:TextBox ID="TextBox1" runat="server" TextMode="MultiLine" Rows="10" Columns="50"></asp:TextBox>
        </div>
    </form>
</body>
</html>

Default.aspx.cs (Code Behind)

using System;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace WebApplication5
{
    public partial class WebForm1 : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
        }

        protected void btnAddSelected_Click(object sender, EventArgs e)
        {
            TextBox1.Text = "";
            foreach (ListItem item in ListBox1.Items)
            {
                if (item.Selected)
                {
                    TextBox1.Text += item.Text + Environment.NewLine;
                }
            }
        }

        protected void btnAddAll_Click(object sender, EventArgs e)
        {
            TextBox1.Text = "";
            foreach (ListItem item in ListBox1.Items)
            {
                TextBox1.Text += item.Text + Environment.NewLine;
            }
        }
    }
}

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