无法从服务器端关闭fancybox

Question

我试过了：

if (pdfDocumentinBytes!= null)
{
    Response.Clear();
    Response.ClearHeaders();
    Response.ClearContent();
    Response.ContentType = "application/pdf";
    Response.AppendHeader("Content", "attachment; filename=" + this.documentName + ".pdf");
    Response.BinaryWrite(pdfDocumentinBytes);
    Response.End();
}

ScriptManager.RegisterStartupScript(this.Page, this.GetType(), "script", "fancyboxClose();", true);

fancyboxClose()是一个函数，它只是在从服务器端调用时关闭花式框。