Response.WriteFile Help

Every so
often I am seeing this error in the Event Viewer on Windows 2003
Server. It  related to a file that pulls documents from a SQL server db using Response.BinaryWrite. When it pulls a file of about 2MB it creates a warning in the EventViewer. I was told to look at using Response.WriteFile to pull the file instead. I found this page: http://support.microsoft.com/kb/306654  which talks about it but doesnt give an explination on how to integrate with grabbing the content. Does anyone know how to pull db content and use WriteFile and put the file into the Response. Similar to this:
 
Response.Buffer = True
Response.Clear()
Response.ContentType = contentType
Response.AddHeader("content-disposition", "attachment; filename=" + fileName)
Response.BinaryWrite(content)
Response.Flush()
Response.End()