Dropdownlist populates Text Box in ASP.net

I have a query that populates a drop down list. It has two fields NAME | TERRITORY

Textbox is blank. When end user selects the drop down list then the TERRITORY is populated in the textbox.

How can I do this in ASP.NET

Here is my code

<%@ Page Language="VB" AutoEventWireup="false" CodeFile="Default.aspx.vb" 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>
    <form id="form1" runat="server">
        <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
            DataSourceID="SqlDataSource1" DataTextField="name" DataValueField="name" 
            Height="26px" Width="127px">
        <asp:SqlDataSource ID="SqlDataSource1" runat="server" 
            ConnectionString="<%$ ConnectionStrings:ordersConnectionString %>" 
            SelectCommand="SELECT [name], [territory] FROM [names]"></asp:SqlDataSource>
    <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>

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Set the  'TERRITORY' as the valuefield of  that dropdownlist and use below given code
  <asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" 
            DataSourceID="SqlDataSource1" DataTextField="name" DataValueField="name" 
            Height="26px" Width="127px" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
 protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
         TextBox1.Text=  DropDownList1.SelectedValue;

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One more thing is in this HTML code u should set the 'DataValueField=TERRITORY' .
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