Lecture#3 ka Point#78 (Csharp Roman Hindi/Urdu Me).

Jab hum apne program me data ko validate kr rhey hon ge ya phir data pe koi check lga rhey hongey to isey hum "Business logic" kahen ge. For Example: if(weight > 0){..........}

Agar instance variable jisey hum apne program ki kisi property(get & set) me use kr rhey hon ge to best practice yeh hai k according to requirement hum is instance variable ka access modifier private rakhey kyun k hum property me use values ko check lga k safe kr saktey hain lakin instance variable ki value ko safe nahi kr saktey matlab yeh k agar instance variable ka access modifier public hoga to koi bhi class k bahr se is instance variable ko access kr sakta hai aur is ki value change bhi kr sakta hai.