Populate textbox from dropdown control selection asp.net visual studio 2008

I have a dropdown control with a number of options in asp.net page

If I select an option from the dropdown list I want to the selected text of the dropdown to be appended to a multi line textbox on the same form.

If I select another option from the dropdown control I want that selected text to also be appended to the textbox.  So the end result would be a multi line text box populated with say upto 6 lines.

I need a quick over view demo not a link to another site

Thanks

mugseyAsked:
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DhaestCommented:
A very easy example
ASPX-file
---------
<%@ Page Language="C#" AutoEventWireup="true"  CodeFile="Default.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">
    <asp:DropDownList ID="DropDownList1" runat="server" 
        onselectedindexchanged="DropDownList1_SelectedIndexChanged" 
        AutoPostBack="True">
        <asp:ListItem>Item1</asp:ListItem>
        <asp:ListItem>Item2</asp:ListItem>
        <asp:ListItem Value="Item3"></asp:ListItem>
        <asp:ListItem>Item4</asp:ListItem>
        <asp:ListItem>Item5</asp:ListItem>
        <asp:ListItem>Item6</asp:ListItem>
        <asp:ListItem>Item7</asp:ListItem>
    </asp:DropDownList>
    <p>
    <asp:TextBox ID="TextBox1" runat="server" Height="141px" Rows="6" 
            TextMode="MultiLine"></asp:TextBox>
    </p>
    </form>
</body>
</html>
 
 
ASPX.CS-file
------------
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)
    {
 
 
 
        if (!Page.IsPostBack)
        {
        }
 
    }
 
    protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
    {
        TextBox1.Text += DropDownList1.SelectedValue + System.Environment.NewLine;
    }
    
 
}

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