[how to ] add random value at the end of string

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hello friends , i m doing a project on windows forms. i m generating a barcode from vehicle number only but i m afraid that if i generate it from vehicle number only i can get old receipts again for other days also. i want to add some value to it randomnly everyday so that the old receipts cannot be used. i cannot use encrytion techniques cuz its too long for me to print barcode for it neither i can use date due to length problem , please provide me with some help
bishnu karki

Posted 24-Oct-11 5:19am

bishnu karki

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BillWoodruff 24-Oct-11 14:00pm

It might help clarify your question if you say what the limit of the number of characters you can write out in the bar-code is.

And, just curious, if you take a vehicle number and add the current date and time to it, doesn't that create a unique code that will allow you to distinguish each receipt ?

I guess I'm asking why you are using a random number.

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Mehdi Gholam · Answer 1 · 2011-10-24T05:23:00

Solution 1

Use the following code it will add a random number between 0 and 1000 to the oldstring:

C#

Random r = new Random((int)DateTime.Now.Ticks);
string str = oldstring + r.Next(1000);

Posted 24-Oct-11 5:23am

Mehdi Gholam

BobJanova · Answer 2 · 2011-10-24T06:51:00

If it is literally per day, use the day number (the integer part of the result of DateTime.ToOADate[^]). If you want to obfuscate it, do something like XORing the day number with the vehicle number. If you want finer resolution, you can make use of the fractional part, or use DateTime.Now.Hour etc as part of the formula.

Anuja Pawar Indore · Answer 3 · 2011-10-24T22:21:00

Solution 4

Refer this thread

http://stackoverflow.com/questions/1122483/c-sharp-random-string-generator[^]

Posted 24-Oct-11 22:21pm

Anuja Pawar Indore