How to set the name of the file when streaming a Pdf in a browser?

System.IO.MemoryStream stream = new System.IO.MemoryStream();

stream = (System.IO.MemoryStream)this.Report.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);

this.Response.Clear();
this.Response.Buffer = true;
this.Response.ContentType = "application/pdf";
this.Response.BinaryWrite(stream.ToArray());
this.Response.End();

Content-Disposition: inline; filename=foo.pdf

System.IO.MemoryStream stream = new System.IO.MemoryStream();

stream = (System.IO.MemoryStream)this.Report.ExportToStream(CrystalDecisions.Shared.ExportFormatType.PortableDocFormat);

this.Response.Clear();
this.Response.Buffer = true;
this.Response.ContentType = "application/pdf";
this.Response.AddHeader("Content-Disposition", "attachment; filename=""+FILENAME+""");
this.Response.BinaryWrite(stream.ToArray());
this.Response.End();