字符串转成字符数组，同时控制输出字符数——ToCharArray、Response.Write新用法(2006-04-20 15:32)

1.char[] String.ToCharArray(int startIndex,int length) :将字符串中的字符复制到字符数组
   string a;
   a = "123456";
   char[] b;
   b = a.ToCharArray(3,3);//此时b={'4','5','6'}
2.Response.Write(char[] buffer,int startIndex,int length):输出内容到页面
  this.Response.Write(b,1,2);//此时页面显示的是56