Rasulullah (Sallallaahu-alayhi-wasallam) used to recite Bismillaahir rahmaanir raheem before doing any work. And he (sallallaahu-alayhi-wasallam) also advised the Ummah to do the same. For example, reading it before shutting the door for the night, before putting out the light, before taking meals, before drinking water, before boarding a conveyance, and when alighting any conveyance.

REMEMBERING ALLAH THROUGH HIS THREE THOUSAND NAMES
It is mentioned in Tafseer Roohul Bayaan that Allaamah Sayyid Haqqi (RadiAllahu anh) said that Allah Ta'ala has three thousand names. He revealed one thousand to the angels; one thousand to the Ambiya AS, three hundred are mentioned in the Torah, three hundred in the Zaboor, three hundred in the Injeel, and ninety-nine in the Noble Quran. One Name He has kept to Himself; He revealed it to no one. Also, He has condensed all His names into the three names contained in Bismillaahir rahmaanir raheem. They are Allah, Rahmaan and Raheem. Any person saying Bismillaahir rahmaanir raheem; it is as though he has remembered Allah by all His Names.

SAYING BISMILLAH BEFORE WUDHU
Rasulullah (Sallailaahu-alayhi-wasallam) said: "One who does not say Bismillah before Wudhu, his Wudhu is incomplete." (Tirmithi). It is reported from Sayyadina Abu Hurayrah (RadiAllahu anh) that anyone who does not say Bismillah before Wudhu, only the sins committed by the limbs which are washed in Wudhu will be washed away; and one who says Bismillah before Wudhu, the sins of the entire body will be washed away. (Mishkaat)

SAYING BISMILLAH BEFORE MEALS
Sayyidina Umar Ibne Abee Salmah (RadiAllahu anh) reports that Rasulullah (Sallallaahu-alayhi-wasallam) said to me: "Say Bismillah and eat with your right hand the food that is in front of you." (Bukhari, Muslim, Tirmithi)

Whoever ate without saying Bismillah, Rasulullah (Sallallaahu-alayhi-wasallam) would hold his hand and urge him to say Bismillah. (Zaadul Ma'aad, Uswah-e-Rasoole Akram).

The Ulama have said that it is preferable to say the Bismillah aloud so that it is a reminder for those who forget. Also, Ibnu Habbaan is reported as saying that if Bismillah is said prior to utilising any bounty of Allah and Alhamdulillah is said after utilising it, the user will not be asked to the give accountability for that bounty on the Day of Qiyaamah.

WHEN UNDRESSING
Sayyadina Anas (RadiAllahu anh) reports from Rasulullah (Sallallaa-hu-alayhi-wasallam) that when a person undresses for the purpose of either relieving himself or bathing or having relations with his spouse then the Shaytan interferes with them. But if he or she says Bismillah BEFORE taking off the clothes, then this serves as a barrier and safety against the Shaytan and jinn. (Tirmithi)