public bool insert(string name, string classs, string sex, string tel, string qq, string remark, string no)
{
str = "insert into student (name,[class],sex,tel,qq,remark1,remark2) values('" + name + "','" + classs + "','" + sex + "','" + tel + "','" + qq + "','" + remark + "','" + no + "')";
return(sql.ExecSql(str));
}