If I understand you correctly, what you need is a server-side text box (ie, runat=server) and a server-side button.
Say your page is called "entry.aspx". The text box ID is "TextBox1" and the button ID is "Button1".
In the code-behind (entry.aspx.vb
) you will have an event handler for the Button1_onclick event. It might look like this in VB
if TextBox1.text = "" then
RegisterClientScriptBlock("X","alert('Please enter a stock symbol');")
Response.Redirect("display.aspx?symbol=" & TextBox1.text)
You then have a page "display.aspx" that uses the querystring to determine which stock quote to display.
Or, if you have hard-coded pages, you just replace that else ... section with a select case TextBox1.text structure and redirect to the appropriate page.
I don't know if this is what your stuck on... I hope it helps.