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If I dynamically add controls in ASP.NET, how do I retrieve their values on subsequent posting?

If I dynamically add controls in ASP.NET, how do I retrieve their values on subsequent posting?
For example this form:

<form id="form1" runat="server">
<div>
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True" OnSelectedIndexChanged="DropDownList1_SelectedIndexChanged">
<asp:ListItem>1</asp:ListItem>
<asp:ListItem>2</asp:ListItem>
<asp:ListItem>3</asp:ListItem>
</asp:DropDownList><br />
<asp:Panel ID="Panel1" runat="server" Height="50px" Width="436px">
<asp:FileUpload ID="fileUpload1" runat="server" Width="429px" /></asp:Panel>
<asp:Button ID="Button1" runat="server" OnClick="Button1_Click" Text="Button" />
<br />
<br />
<asp:ListBox ID="ListBox1" runat="server" Width="379px"></asp:ListBox></div>
</form>

has a dropdown list that when changed runs this:

for (int i = 2; i < Convert.ToInt32(DropDownList1.SelectedIndex)+ 2; i++)
{
FileUpload fileUpload = new FileUpload();
fileUpload.ID = "fileUpload" + i.ToString();
Panel1.Controls.Add(fileUpload);
}

I need code for the button that will get the file names from however many controls were added with the drop down list.

SOLUTION

Bob Learned

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ASKER CERTIFIED SOLUTION

Éric Moreau

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ksaul

ASKER

Bob,
Can you give me some sample code of how to do that? I would need to retain entered values when I re-create them.

SOLUTION

Bob Learned

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ksaul

ASKER

I'm going to split points for your suggestions.

I decided that for this situation it was better to create 25 design-time FileUpload controls setting their style property to display:none and then use javascript to show and enable as many as the user needed. That made looping through the controls after the post much easier.