Question

I am overriding Render like this:

protected override void Render(HtmlTextWriter writer)
{
    var keyCheck = HttpContext.Current.Session["PaymentSearchResults"];

    if (_exportToExcel && keyCheck != null)
    {
        ExportToExcel();
        return;
    }

    base.Render(writer);
}

To download an Excel file which I’m adding to the response like this inside the ExportToExcel method:

File.WriteAllBytes(tempFileName, buffer);

Response.ContentType = "application/ms-excel";
Response.WriteFile(tempFileName);

HttpContext.Current.ApplicationInstance.CompleteRequest();

However, the response is never getting back to the browser and so the browser just hangs.

What am I doing wrong?

Answer 1

This is what i use, in a button click event. works like a charm.

HttpContext httpCtx = System.Web.HttpContext.Current;

httpCtx.Response.Clear();
httpCtx.Response.AddHeader("content-disposition", string.Format("attachment; filename={0}", fileName));
httpCtx.Response.ContentType = "application/vnd.ms-excel";
httpCtx.Response.Charset = "utf-8";

httpCtx.Response.WriteFile(filePath);

httpCtx.Response.End();