ASP.Net Exporting dataset/repeater/html to excel

I have an application that exports any of the above types to excel using    
response.ContentType = "application/"

Recently the app stopped working, the excel report page flashes on the screen and then disappears.  Is anyone else running into this with IE or IIS upgrades?  These were originally built on Win2000Server recently migrated to Win2003Server.
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I've recently experienced a similar issue, however I couldn't attribute it to the web server. I found an inconsistency with WinXP SP2 browsers having this issue. I forgot exactly what I was doing, but it was something like redirecting to a different file and then firing a window.close() from javascript. It worked all the time before and then stopped working on XP SP2 machines. I had to add some workaround javascript. I don't know if this is what's happening to you, just sharing my 2 cents. Can you post some more of your sample code?
Nobletucky2004Author Commented:
    response.Charset = "";
    //set the response mime type for excel
    response.ContentType = "application/";
    //create a string writer
    System.IO.StringWriter stringWrite  = new System.IO.StringWriter();
    //create an htmltextwriter which uses the stringwriter
    System.Web.UI.HtmlTextWriter htmlWrite = new System.Web.UI.HtmlTextWriter(stringWrite);
    //instantiate a datagrid
    DataGrid dg = new DataGrid();
    //set the datagrid datasource to the dataset passed in
    dg.DataSource = ds.Tables[0];
    //bind the datagrid
    //tell the datagrid to render itself to our htmltextwriter
    //all that//s left is to output the html
Nobletucky2004Author Commented:
what type of JavaScript workaround did you use to alleviate this problem?
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The case I had is that I was popping up a window from the existing window (after some browser detection was done) and i was initially doing this:;

When this stopped working I had to do this:;

function fClose(){

then from the window that popped up I did a:


This doesn't seem to be your issue though. I'm gonna refer this question to a friend of mine that's more .net savvy

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Nobletucky2004Author Commented:
Could this have something to do with a setting that is dealing with Trusted Sites.  It seems that when the URL is added to Trusted Sites the files will open in excel, but that presents an issue with having to figure out if users have the URL set in trusted sites, that is rather messy.
Interesting. Is you IE security set beyond default? Try going into Tools -> Internet Options -> Security and setting the internet zone to the default setting and see what happens.
Nobletucky2004Author Commented:
yea, most users that are testing this now have default security settings post an SP2 update.
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