public int RunSQL(string cmdText, SqlParameter[] prams)
        {
            SqlCommand cmd = CreateSQLCommand(cmdText, prams);
            try
            {
                cmd.ExecuteNonQuery();
                //return (int)cmd.ExecuteNonQuery(); 这句我写的，觉得还好写啊
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            finally
            {
                Close();
            }
            return (int)cmd.Parameters[RETURNVALUE].Value; //我上面的语句可以完全替换吗？有什么区别啊？
            
        }

public bool Add_User(User user)
        {
            SqlParameter[] paramList ={
                 sqlHelper.CreateInParam("@uid",SqlDbType.VarChar,50,user.uid),
                 sqlHelper.CreateInParam("@pwd",SqlDbType.VarChar,50,user.pwd),
                 sqlHelper.CreateInParam("@name",SqlDbType.VarChar,50,user.name),
                
            };
            string sql = "insert into tt_User (uid,pwd,name) values (@uid,@pwd,@name)";
            int count = sqlHelper.RunSQL(sql, paramList);//不知道参数都是这么设置的吗？也添加了记录，就是返回的值不对，判断不对
            if (count > 0)
            {
                return true;
            }
            else
            {
                return false;
            }
 
        }