MyLog.DebugInfo("request default.aspx");
 String echoStr = Request.QueryString["echostr"];
 MyLog.DebugInfo("echoStr:"+echoStr);
 if (this.checkSignature())
 {
 if(!string.IsNullOrEmpty(echoStr)){
 MyLog.DebugInfo("echostr:" + echoStr);
 Response.Write(echoStr);
 Response.End();
 }
 
 }

private bool checkSignature()
{
 
 string signature = Request["signature"];
 string timestamp = Request["timestamp"];
 string nonce = Request["nonce"];
 MyLog.DebugInfo(String.Format("signature:{0},timestamp:{1},nonce:{2}", signature, timestamp, nonce));
 string token = TOKEN;
 string[] tmpArr = new string[] { token, timestamp, nonce };
 Array.Sort(tmpArr);
 string tmpStr = string.Join("", tmpArr);
 //sha1加密
 System.Security.Cryptography.SHA1 sha1 = new System.Security.Cryptography.SHA1CryptoServiceProvider();
 byte[] secArr = sha1.ComputeHash(System.Text.Encoding.Default.GetBytes(tmpStr));
 tmpStr = BitConverter.ToString(secArr).Replace("-", "").ToLower();
 MyLog.DebugInfo(String.Format("after parse:{0}", tmpStr));
 if (tmpStr == signature)
 {
 MyLog.DebugInfo("true");
 return true;
 }
 else
 {
 return false;
 }
}