最近写了个小小的活动，前端页面有一个按钮 按钮调用事件如下：

function fn_getInfo()

{

$.get("../Code/Ajax.ashx?type=2&uarea=" + currselectvalue + "&urole=" + args + "&rid=" + Math.random(), "", function(responseValue) {

...............｝

}

这个异步调用的方法如下：

public string ToSendPrizesUser()

{

    .........................................

      int xx =  查询日志 (日志方法加了try {}cathc{}块 默认值返回-1   )

　　if(xx ==0)

      {

          result =   ToPrizes()  方法如下

      }else { result = 0;}

 　 return result;

}

        public static int ToPrizes(.............................................................)
        {
            int result = 0;
            TransactionOptions option = new TransactionOptions();
            option.IsolationLevel = System.Transactions.IsolationLevel.RepeatableRead;

            using (TransactionScope scope = new TransactionScope(TransactionScopeOption.Required, option))
            {
                try
                {
                    DataView dv = GetRoleInfo(.....);
                    if (dv.Count > 0)
                    {
                        DataRowView dr = dv[0];

                        int dwi = 方法（调用接口发送数据）;
                        if (dwi == 5)  // 发送成功
                        {
                              //写日志
                            int logi = Code.DecemberActiveLog.AddActiveLog(.....................l);
                            if (logi > 0) //日志写成功
                            {
                                result = 1;//成功
                            }
                        }
                    }
                    scope.Complete();
                }
                catch (Exception ex) { throw ex; }
                finally { scope.Dispose(); }
            }
            return result;
        }

 日志查询方法：

        public static int ToolsDayExists(int userid)
        {
            int result = -1;

            StringBuilder strsql = new StringBuilder();
            strsql.AppendFormat(@"SELECT Count(*) FROM NovemberSendLog WHERE UserID = '{0}' ", userid);

            try
            {
                object obj = SqlHelper.ExecuteScalar(Config.ConnectionString, CommandType.Text, strsql.ToString());

                if (obj != DBNull.Value && obj != null)
                {
                    result = int.Parse(obj.ToString());
                }
            }
            catch
            { result = -1; }
            return result;
        }

出现问题，有及个别用户产生了两条日志记录！情况如下：

222.137.149.186        2           1           2010-12-08 23: 32:21.000       1    
222.137.149.186        2           1           2010-12-08 23:32:22.000       0    

我对异步也不是很熟悉，只是用起来比较简单，不知道哪位大侠能帮我分析下 问题出在那里？

不求详解，有个思路就行~  万分感谢!