Web Forms :: Can Use HttpResponse From An Ascx File

I am looking to render excel from an web control. I have code that works from a web page, but when I run it in an ascx.cs file it doesn't do anything.

Is there something about being in an ascx that makes a difference?

Here is my code:

Response.ClearContent();
Response.AddHeader("content-disposition", "attachment; filename=file.xls");
Response.ContentType = "application/vnd.ms-excel";
Response.BinaryWrite(result);
Response.End();
Response.Flush();