public Liuyanban()
{
dbconn = new sqldbconn();
}
public Admin()
{
dbconn = new sqldbconn();
}
public Leibie()
{
dbconn = new sqldbconn();
}
public users()
{
dbconn = new sqldbconn();
}
public Dingdan()
{
dbconn = new sqldbconn();
}