var strContent = "aaaaa";
html.Append("<html><body><form id='postUploadFile' name='downloadFile' runat='server' style='
display:none' method='post' >");
html.Append("<input id='fileData' name='btData' type='hidden' value='" + strContent + "' />");
html.Append("</form></body></html>");
html.Append("<script type='text/javascript'>(function(){document.getElementById('postUploadFile').action = '");
html.Append(serverPath + "/postUploadFile.ashx?random=" + random + "';document.getElementById('postUploadFile').submit();})();</script>");
Response.Write(html.ToString());
Response.Flush();
