integrating barcode to crystal report using asp.net

How about simply using some barcode font ?

There are even some free barcode fonts around ...

Hmmm - thining about it, I would recommend another strategy.

Even a not so bright student would be able to just read out / generate such a barcode himself - the effort to tweak would IMHO quite low.

I would try to do some sophisticated algorithm on the data on the form to generate a complex checksum. That checksum would be a signature of the data, and it could be verified by just repeating the algorithm. I wouldn't be necessary to print it as barcode, because it is intrinsic safe even if easy readable.

Here's an example algorithm approach how to do such a checksum:

Convert each answer result into a string representation, i.e. "09-05-T" for the 9th question in a multiple choice test, ticked answer 5 which was correct (T for true). Or "13-01-F" for question 13, ticked answer 1, failed (F for false). Code Student name, date of bith, semester, date and time of the test etc. (anything which is on the form) together into another String. Concatenate that together with the results to a long string and end it with a non disclosed signature to make hacking less simple, like

Smith*John*Sem03*1998-12-13*2015-02-04*01-03-T*02-05-T*03-01-F* .... *38-04-T*RESULT089*C3FCD3D76192E4007DFB496CCA67E13B

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Calculate a MD5 checksum (see here for an explanation) of that string (here's an example how to do that in C#, but there's a lot more examples on the net) and print it onto your form in a not too prominent place. You might fool the hacker guys by obfuscating the code a bit, i.e. by programmatically shuffling the 32 charaters around a bit, possibly enclose it in some random junk and grouping them in a fancy way like

C3FCD3D76192E4007DFB496CCA67E13B

  represented as

A7-S3FF-7DFB-496C/CA67-E1-3B-GZ-C3F/CD3D-76-192E#400-RG-99-XX

(exchanged first and second half of the checksum string, added 5 useless random characters to the start and 6 at the end, and finally inserted fancy (and even meaning-free) separators ). The obfuscation is easily reversible with a program if it follows rules ...

By the way, the signature mentioned above has the format of an MD5 checksum, too. You might i.e. generate it from a part of the "string w/o signature, i.e. the first n characters or as much charaters as the day in the birthdate reads, or, or, or ...

The trick is that if in doubt you enter the form content into some program that just uses the code that generated the checksum. If everything is correct, the generated checksum is the same. Otherwise the form was tweaked. And the checksum generation is too complex to be easily hacked (and if somebody manages to hack the thing, he deserves a computing degree already :-).

Are you using Crystal to generate the bar code?

If not, how is Crystal related to this question?

mlmcc

I am using crystal report generating report..... not for generating barcode.

how to place barcode image gnerated runtime in crystal report. do i need any third party control/dll/api. or can i do directly.

thanks

If you insist on the barcode, you'll just have to use the barcode font for the data. That way the data is automatic formatted as barcode. No control, no dll, no API. Just insert a text field and format it to be diplayed with the barcode font.

I presume the report to be displayed as PDF, so the barcode font only needs to be installed on the machine with the CR on it (where the reports are being generated). Maybe you have to set up CR to embed the font into the pdf.

Nevertheless I would use some algorithm as I've pointed out before.