void MakeTreeRoot()
{
SqlDataReader reader;
Database data=new Database();
string sql="select * from sHelpMenu order by ID";
data.RunSelect(sql,out reader);
//以上代码获得数据集,Database是我自己的类,诸位可以改成通用的方法
//如果ID定义为int型则每段ID或者FatherID的范围必须在10到99之间.
//如果ID为varchar型,则上面的sql因写成select * from sHelpMenu order by cast(ID as int)
while(reader.Read())
{