Sir I am using these codes to connect sqlserver database

Pubic con1
m.lcCONN1 = 'Driver={sql server}; server=SERVER\SQLEXPRESS;Database=' + m.db1 + '; Uid=sa; Pwd=123'
lcCONN1 = STRT(lcCONN1,CHR(13),'')
lcCONN1 = STRT(lcCONN1,CHR(10),'')
con1 = SQLstringCONNECT(lcCONN1)

Database connects successfully.

Now I try to disconnect database with following codes

Messagebox(m.con1)
SQLDisconnect(m.con1)
Messagebox(m.con1)

Messagebox display same value both time.
It means database does not disconnect.

What I doing wrong?

Please help