查询语句,该如何处理_ASP.NET

查询语句

C# code

        sql += ") values('";                int j = 0;        foreach (Field unfield in fieldArray)        {            if (!unfield.Value.Equals(String.Empty))            {                sql += unfield.Value;                if (j < 5)                {                    sql += "','";                }                j++;                            }        }        sql += "');";

You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near ') values('sdsdsds','dsd','sdsdsd','sd','')' at line 1

为什么上面会这样呢..
我上面注册页面只要输入五个值,然后值存放在一个自己写的Field里,要把5个Field放入ArrayList里,可是为什么执行完后会多出",''"这个字符串呀,,请大家帮帮忙呀??

------解决方案--------------------------------------------------------
改成这样试试还不行只能跟踪调式了这样改改应该可以了

C# code

        sql += ") values('";                int j = 0;        foreach (Field unfield in fieldArray)        {                j++;            if (!unfield.Value.Equals(String.Empty))            {                sql += unfield.Value;                if (j < 5)                {                    sql += "','";                }                                            }        }        sql += "');";