请高手看看这段代码,插入数据问题
///   <summary>
///   获取随机字符串
///   </summary>
///   <param   name= "strLength "> 字符串长度 </param>
///   <param   name= "Seed "> 随机函数种子值 </param>
///   <param   name= "Rows "> 字符串行数 </param>
///   <param   name= "num "> 批号 </param>
///   <returns> 指定长度的随机字符串 </returns>
public   static   string   RndString(int   num,int   Rows,params   int[]   Seed   )
{
string   strSep   =   ", ";
char[]   chrSep   =   strSep.ToCharArray();
//因1与l不容易分清楚，所以去除
string   strChar   =   "2,3,4,5,6,7,8,9,a,b,c,d,e,f,g,h,j,k,m,n,p,q,r,s,t,u,v,w,x,y,z ";
string[]   aryChar=   strChar.Split(   chrSep,   strChar.Length   );
string   strRandom   =   string.Empty;
int   strLength=7;
Random   Rnd;
if(   Seed   !=   null   &&   Seed.Length   >   0   )
{
Rnd   =   new   Random(   Seed[0]   );
}
else
{
Rnd   =   new   Random();
}
for(int   j=0   ;   j   <   Rows;   j++)//分行
{
//生成随机字符串
for(   int   i=0;   i   <   strLength;   i++   )
{
strRandom   +=aryChar[Rnd.Next(   aryChar.Length   )];
}
string   sql   =   "Insert   into   edu_card(card_id)   values( ' "+strRandom+ " ') ";
include.insertData(sql);
strRandom   =strRandom+num+ " <br> ";
}
return   strRandom;
}

我要随机生成7位字符串,分行插入数据库,现在这个方法只能插入第一行,不能循环插入,怎么写才能循环插入?

------解决方案--------------------
这个函数是 生成串
你可以使用如下方法：

ArrayList al = new ArrayList();
private void button1_Click(object sender, EventArgs e)
{
//ArrayList al = new ArrayList();
for (int i = 0; i < 100; i++)
{
string s_Rand = RndString(/*your params*/);
al.Add(s_Rand);
}
}

private bool AddToSQL(string s_Rand)
{
//处理SQL操作
}
public void AddToSQLList(ArrayList _al)
{
for (int i = 0; i < _al.Count; i++)
{
AddToSQL(((string)_al[i]));
}
}