update excel on web

Hi all,

I am needing some suggestions as to how I can update excel on web. Following is the code that I am currently using:

Response.Clear();
Response.Buffer= true;
Response.ContentType = "application/vnd.ms-excel";
Response.Charset = "";

System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);

this.ClearControls(dg);
dg.RenderControl(oHtmlTextWriter);

Response.Write(oStringWriter.ToString());

Response.End();

This will result in opening an excel interface that fills up the whole page.
What I am wanting to do are:
1. Open an excel interface that doesn't fill up the page; the page will have search capability on the top and the result in excel interface on the bottom.
2. Update the excel content and click a button to cache the updated excel content so I can update my database.

Does anyone know how to do those things?

Some more info:

If I could not get the excel interface on the same window, I think I can just open a new window (different aspx page). However, I still want to cache the updates when the excel window is closed.
If you could help me with caching, that would be AWESOME!!!