Creating a Custom Export to Excel for ReportViewer (rdlc)

Question

I'm interested in creating a custom Export to Excel option for my Report in ReportViewer. This is mostly because I want pdf disalbed and I did that via:

 ReportViewer1.ShowExportControls = false;

Since there is no way to disable any specific export functionality (e.g. pdf but not excel) in ReportViewer. Here's my (slightly) modified code below. Ideally I would like something similar to the previous Export options where I can save the file to whatever location I want.

EDIT: The code works but how would I need to modify the Filestream so that instead of having the file get saved automatically I can prompt the user so that they can save to whichever location they want?

protected void btnExportExcel_Click(object sender, EventArgs e)
{
    Warning[] warnings;
    string[] streamids;
    string mimeType;
    string encoding;
    string extension;

    byte[] bytes = ReportViewer1.LocalReport.Render(
       "Excel", null, out mimeType, out encoding,
        out extension,
       out streamids, out warnings);

    FileStream fs = new FileStream(@"c:\output.xls",
       FileMode.Create);
    fs.Write(bytes, 0, bytes.Length);
    fs.Close();

}

Answer 1

I put this together based on Microsoft's documentation on ReportViewer and some Google searches in case anyone runs into the issue similar to mine:

protected void ExportExcel_Click(object sender, EventArgs e)
{
    Warning[] warnings;
    string[] streamids;
    string mimeType;
    string encoding;
    string extension;
    string filename;

    byte[] bytes = ReportViewer1.LocalReport.Render(
       "Excel", null, out mimeType, out encoding,
        out extension,
       out streamids, out warnings);

    filename = string.Format("{0}.{1}", "ExportToExcel", "xls");
    Response.ClearHeaders();
    Response.Clear();
    Response.AddHeader("Content-Disposition", "attachment;filename=" + filename);
    Response.ContentType = mimeType;
    Response.BinaryWrite(bytes);
    Response.Flush();
    Response.End();
}