How to check the string entries in vs with database

Question

Hi friends I have a user table that contains username and password and other properties For example in the database I have username = JOHN and password = 1234JOHN When i input in visual studio Username = john and password = 1234joHn C # accepts this does not return an error I hope that I have described my problem well and I will be happy if someone helps me to solve this problem thank you in advance

Hassan Uddin Mughal · Answer

I didn't understand. Can you please explain me what is the problem you are facing? and what are you trying to do in your program?

ma ouml · Answer

Hassan Uddin Mughal Yes that's it What should I do now?

Hassan Uddin Mughal · Answer

If I understand your question you are comparing string and varchar datatypes? You can say that varchar and string are equivalent in nature . Because string is an array of unicode characters and varchar (variable-length character string) is a string of text characters. Thats why you are not getting any exception or error.