Postback, XML/XSLT, Gridview, Response object question

[ronc85]

My environment is ASP.NET 2.0, C# and AJAX.

I'm having a problem with 'Button Click' logic which is trying to
display a Gridview and
then use XML/XSLT to build an Excel file. The following code does not
display the Gridview but opens the created file in Excel.If I comment
out the ExportDatasetTo Excel routine the Gridview displays correctly.
I'm assuming the problem is something to do with the Response
methods.

protected void Button1_Click(o bject sender, EventArgs e)
{
ProductLocation objProductLocat ion = new ProductLocation ();
DataSet ds;

ds = objProductLocat ion.GetProductL ocationList();

GridView1.DataS ource = ds;
GridView1.DataB ind();
string excelXsltFileNa me = "ProductLocatio nList.xsl";
string excelOutputFile Name = "ProductLocatio nList.xls";
Hashtable excelXsltArgume nts = null;


ExcelUtility.Ex portDatasetToEx cel(Server.MapP ath(excelXsltFi leName),
excelOutputFile Name,
ds,
Response,
excelXsltArgume nts
);

}

public static bool ExportDatasetTo Excel(string XSLTFileNameWit hPath,
string excelOutputFile Name, DataSet ds, System.Web.Http Response
Response, System.Collecti ons.Hashtable excelXsltArgume nts)
{

if (ds == null && ds.Tables[0].Rows.Count < 1)
return false;

Response.Clear( );
Response.Conten tType = "applicatio n/vnd.ms-excel";
Response.Append Header("Content-Disposition",
"attachment;fil ename=" + excelOutputFile Name);

XslTransform xslt = new XslTransform();
xslt.Load(XSLTF ileNameWithPath );

XsltArgumentLis t xsltArguments = new XsltArgumentLis t();
if (excelXsltArgum ents != null) // Check for parameters to be
passed to XSLT
{
foreach (System.Collect ions.Dictionary Entry de in
excelXsltArgume nts)
xsltArguments.A ddParam(de.Key. ToString(), "",
de.Value);
}
XmlDocument xml = new XmlDocument();
xml.LoadXml(ds. GetXml());

xslt.Transform( xml.CreateNavig ator(), xsltArguments,
Response.Output );
Response.Flush( );
Response.Close( );

return true;

}
Sal P.